I just wish to affirm that I myself actually rather like the introduction and I fully get why things were the way they were, time-traveling Giganotosaurus and all. If you want to see my little TedTalk on that, here it is. But, as a bit of a writing exercise, here is my pitch for an outline of what the opening sequence and some of the plot would look like if the movie was as accurate as possible. Obviously unknowns will always exist, and compromises for the sake of entertainment need be made from time to time; but this is just me giving it a whirl.
We open on the Hell Creek Formation, Montana, 66 million years past. It's a swampy, wooded locale similar to what one would find in Florida's savanna mixed with some of Central Eastern Africa's coast.
We initially zoom in on a Brachychampsa which at first glance looks like a modern alligator, but the facial anatomy and colors are a bit different. Standing on its back is what at first appears to be a fishing eagle, but when it perks up, we can see this Avisaurus actually has mouthfuls of teeth. They are in a river in which the water starts to quake, we hear distant footsteps. A herd of Alamosaurus roams through the drier woodlands, walking between the trees and towards a river. Their approach shifts a lot of water, kicking up a great amount of water. Our crocodilian and bird scatter, with POV following the bird upwards across the river until it flies off past a Quetzalcoatluscoming in for a landing. Here is where we get a sense of scale as one quetz tries to grab at the alligator from earlier, showing the Brachychampsa is but a lizard in comparative size.
The pterosaur perks up at a booming roar and gets airborne, following it. We hitch a ride on its back, as this sequence has few to no cuts and goes directly from one animal to another in a similar manner to Disney's Dinosaur in the opening act. The Quetz soars over a herd of migrating Edmontosaurus, and tries to pick off an infant on the fridge of the herd but is forced back by an irate adult. The same adult, now our focus animal.
The Edmontosaurus turns and walks back to the woodline to feed. It however, hears that roar again in the distance and pauses. This causes a large branch it was chewing on to fall as the Edmontosaurus departs. The camera pans down to the branch and reveals a familiar sickle-claw shape. The audience is given a very similar look at several more of the same feet, akin to the reveal of the raptor squad from Jurassic World, only for the camera to pan up and reveal several eagle-like Dakotaraptors.
The raptors consider the herd but move off, instead taking the branches to help construct their nests hidden within the treeline. One of them has already laid its eggs and carefully tends to the nest. However, something stirs and a form goes for the eggs. It's a strange, long-legged, short armed carnivore who tries to grab an egg but is forced back by the irate parent raptors. The angered dromaeosaurids chase the creature out of the forest.
Our POV is now on the beast, and the raptors start to catch up but the sound of a deep, bellowing roar forces them to back off as a shadow emerges over the would-be-egg robber. A hunk of torn-off flesh is dropped on the ground and we get the reveal, cast in the shadow of the sunlight, of a fully grown Tyrannosaurus.
Our Tyrannosaurus can vary in look or color, with the feathers either being prominent or very toned down (elephant-hair levels of fuzz to having a mane of sorts). But for coloration it would be markedly different than what we'd gotten prior, with some dashes of red or white on the keratinized face. Our POV creature however doesn't run, and this is how the audience is tipped off that this is actually a juvenile T.rex when the parent leans down and nuzzles their offspring, nudging the meat closer. This is before it lays down to nap, the offspring eagerly gobbling down multiple bites.
But as the juvenile heads towards a small watering hole nearby to wash down its meal, we hear that loud roar again. Only now we see it was not coming from the Tyrannosaurus. It's deep, echoing, and much closer. For a reference, this is the sort of roar I'm thinking of. The juvie T.rex backs off as something big approaches. We pan from the Juvie T.rex across the watering hole, to the reflection of a truly imposing, gnarled, unpleasant looking horned beast. Something akin to this coloration
With this body and quill layout. This is decidedly not the friendly, pitiful sick beast we saw in 1993.
Exactly what this creature is can actually vary. There are some specimens of Triceratops that grew astoundingly huge (11+ meters), far above the average (8 meters). It could also be, if we need to use a brand new genus, Torosaurus or Eotriceratops. The massive herbivore, still swallowing a wad of brush it was eating, leans down to take a drink before sniffing the air with enlarged nasal chambers. It smells the juvenile and bristles its quills, waving its horns as it starts to march into the watering hole. Whether it is being territorial like a hippo or seeking to kill a potential threat before it gets big like how buffalo charge young lions, its clear its bearing down on the juvenile with lethal intent. The juvenile turns to run, but gets bogged down by the mud.
Just as it closes the distance, the big shadow appears again and we finally hear the iconic roar of the franchise T.rex (inaccurate yes, but franchise staple). The parent Tyrannosaurus attacks to defend its offspring and engages the Ceratopsian. The two juggernauts collide in the middle of the watering hole with a deep impact and large splashes of water.
They struggle, the T.rex trying to get around the neck frill, kicking and snapping at it and managing to bite the Ceratopsian across the back. The Ceratopsian however, counters by thrashing to dislodge the T.rex before it can crunch down and itself bites the carnivore across the lower leg. A very sharp beak and powerful jaws cut into the leg and alongside the heavier herbivore thrashing back, topples the imbalanced theropod. The Tyrannosaurus is toppled as the Ceratopsian leans back and lunges, goring the parent carnivore to death as it goes limp. The orphaned juvenile runs away as the triumphant aggressor roars into the air again, a mosquito landing on the corpse as red starts to stain the shores of the watering hole.
Flash forward to the present day. Some time after the movie theater incident, which I think works great with no changes needed, we see Dr. Wu brought to BioSyn CEO Lewis Dodgson. Dodgson makes his point that he doesn't seem to really need Wu anymore, with the facilities they got, embryos, and capturing some feral dinosaurs like one recently recaptured Triceratops. This is when Wu expresses frustrations about having been held back by Masrani for the sake of stocking a theme park. To echo the fourth and third film,
"He never asked me for reality, he asked for more teeth on his theme park monsters... Let me show you what I can really do."
Dodgson gives him his chance to impress him with the one thing Masrani never got. Wu asks for a blood sample from the Trike and for fossils from Montana. A cut to months later, we see a big empty room, like a hollowed out warehouse. The Triceratops, the familiar JW version of docile herbivore, steps in through an opened shutter. It looks around curious, noticing but not caring much for the people it sees watching from above. Wu taps at a touch pad and a shutter on the other side starts to open. We see a familiar set of recurved horns and barbed skin in outline. With some trepidation, Wu taps another button and we see the shadowed dinosaur emerging from the other shutter door get shocked from a collar around its neck. The Triceratops looks on curiously and we see a POV looking at the friendly three-horn, shaking from the shocks. The shocks subside and now the beast is enraged. We hear the same, frieght-train-horn of a roar call out again and the accurate Ceratopsian stampedes forward thinking it is targeting the source of its pain. The InGen Triceratops moves forward to meet it, but the battle is not a lengthy one.
The much more aggressive and powerful BioSyn creation shoves down, tramples over, and mauls the InGen asset in a shot scene not unlike the raptor feeding from the first film. Dodgson watches it all bemused, but not disapproving. He asks what was the earnings from that fight. It turns out investors can place bets and pay high sums to watch what amounts of abusive pit fights. Dodgson, happy to hear they made a pretty penny on Wu's gambit, watches on like a Caesar observing his gladiator.
"That thing just earned up 100 million after taking 250, let's hope it can earn its keep."
From then on, the ceratopsian is used like one part execution tool, one part exhibition piece. Wealthy investors can pay huge sums for 1 of a kind pitfights, even pushing in some extra for a trophy of what the horned killer leaves behind. BioSyn has been recapturing InGen dinosaurs to regain their genomes for their own uses, and when they are done they throw them to the proverbial lions.
And now, Dodgson has his sights set on the biggest piece of Hammond's legacy. The crown jewel. After all, once they'd recapture it and get the genome for Wu to use; imagine how many would pay through the nose to witness a heavyweight grudge match 66 million years in the making for when he pits Rexy/Roberta against his champion?
Videos
The preview takes place both in the past and the present, kicking off 65 million years ago, during the Cretaceous period, and the score was done by composer Michael Giacchino. The preview plays like a nature film where we are following a number of dinosaurs as they wander around the land. It's peaceful and quiet, allowing us to take in the beauty of our planet before humans arrived. In addition, since we’re back in time, we get to see seven new species of dinosaurs, created by the team at Industrial Light & Magic, that have never been seen in any Jurassic film before: Dreadnoughtus, Quetzalcoatlus, Oviraptor, Nasutoceratops, Iguanodon, Morus intrepidus, and Giganotosaurus.
Towards the middle of the extended preview we encounter a T-Rex and a Giganotosaurus fighting, and after a short battle, the T-Rex is killed. As we get a close-up on his eye dilating, we see a mosquito fly in and suck out some blood from the area nearby. Is it the same amber mosquito that John Hammond has on his staff in the first Jurassic Park movie? That is undetermined, but it’s pretty clear this is the origin story of the T-Rex we have come to know and love in the Jurassic films.
As we cut to 65 million years later, we are following the T-Rex as it is racing through a forest being chased by people in a helicopter trying to take it down with a tranquilizer dart. As the race through the forest continues, the T-Rex enters a drive-in parking lot where chaos unfolds as people scramble to escape the massive dinosaur. As the sequence ends, you’ll be left wanting more.
While I could go on and on about why the footage was so impressive, the main thing that left me speechless was how amazing the VFX was in bringing these dinosaurs to life. In the footage you can see the webbing in some of the mouths, chipped teeth, and hair! Trust me, if you are a fan of the Jurassic World series, you are going to want to buy a ticket to F9 in IMAX to see this footage.
Source: https://collider.com/jurassic-world-3-new-dinosaurs-footage-preview-imax/