2023 update: a March 2023 commit provides an update on the situation:
The latest released version of Jython remains 2.7.x (see Jython for that).
This doesn't mean that there isn't any progress on a Jython 3. A lot of exploration has taken place away from the official repository, in order not to pollute it with false starts and dead-ends.
Since the beginning of 2021, Jython 3 exploratory work reached a form that merited porting from the experiment to the main of the official repo. Risky design concepts still begin life in the exploratory environment, then arrive as a PR to the official main branch. Please watch the jython-dev mailing list for developements, or the main branch (not master) of the official Jython repo.
Another update: an August 2020 commit clarified that the repository to look at is not the Jython3 one but the main Jython repo. Anyway "The latest version of Jython remains 2.7.x. A Jython 3.x should appear, but exploratory work towards it is not stable at the time of writing. Please watch the jython-dev mailing list for developements."
Update: 9 years after the question has been originally asked the answer now seems to be not in the near future. Most recent commit is now more than two years old (July 18, 2017), and developers say that the 3.x branch is "resting".
My original answer:
5 years after the question has been asked, the answer is still "it will come, but the time frame for an initial release is not clear yet".
What we can say is that now there is a jython3 repository targetting Python 3.5. README.md, dated 28 May 2015, says:
This repo is in the very early stages of development of a release of Jython 3.5. Planned goals are language and runtime compatibility with CPython 3.5, along with continued substantial support of the Python ecosystem.
Jython FAQ page states that:
Answer from Diego on Stack OverflowJython 3.x development is in progress.
When will Jython support Python 3? - Stack Overflow
Python, Jython, CPython, Libraries, Pip, and Python 2.7 vs 3 - A quick primer
Which Jython version works with Python 3.9
Python 3.7+ Support
2023 update: a March 2023 commit provides an update on the situation:
The latest released version of Jython remains 2.7.x (see Jython for that).
This doesn't mean that there isn't any progress on a Jython 3. A lot of exploration has taken place away from the official repository, in order not to pollute it with false starts and dead-ends.
Since the beginning of 2021, Jython 3 exploratory work reached a form that merited porting from the experiment to the main of the official repo. Risky design concepts still begin life in the exploratory environment, then arrive as a PR to the official main branch. Please watch the jython-dev mailing list for developements, or the main branch (not master) of the official Jython repo.
Another update: an August 2020 commit clarified that the repository to look at is not the Jython3 one but the main Jython repo. Anyway "The latest version of Jython remains 2.7.x. A Jython 3.x should appear, but exploratory work towards it is not stable at the time of writing. Please watch the jython-dev mailing list for developements."
Update: 9 years after the question has been originally asked the answer now seems to be not in the near future. Most recent commit is now more than two years old (July 18, 2017), and developers say that the 3.x branch is "resting".
My original answer:
5 years after the question has been asked, the answer is still "it will come, but the time frame for an initial release is not clear yet".
What we can say is that now there is a jython3 repository targetting Python 3.5. README.md, dated 28 May 2015, says:
This repo is in the very early stages of development of a release of Jython 3.5. Planned goals are language and runtime compatibility with CPython 3.5, along with continued substantial support of the Python ecosystem.
Jython FAQ page states that:
Jython 3.x development is in progress.
Jython roadmap is definitely outdated.
However, on Frank Wierzbicki's Weblog (one of Jython's main developers) you can get an update, telling that Python 3 is definitely on the radar.
Unfortunately, it is not yet clear when, as it is stated in a comment in that same blog from 2010:
Jython will reach 2.6 and later a 3.x, but it's hard to give a solid time frame. I'm hoping to get a 2.6 out in a few months.
In an interview in 2017, Wierzbicki stated that Python 3 is desirable but difficult.
Langfristig wollen wir eine 3.x-Version veröffentlichen, aber das ist ein langwieriger Prozess, weil es eine große Menge an Veränderungen in der 3.x-Serie gab.
English:
We want to publish a version 3.x in the long run, but that is a drawn-out process, because there were a lot of changes in the 3.x series.
Jython – Python in der Java-Welt [Pirates of the JVM], JAXenter, 2017-04-12.
Never seen it before until I opened up this book that was published in 2010. Is it still relevant and what has been created with it?
The book is called Introduction to computing and programming in Python- a multimedia approach. 2nd edition Mark Guzdial , Barbara Ericson