According to Jython's documentation:
Jython is an implementation of the Python language for the Java platform. Jython 2.5 implements the same language as CPython 2.5, and nearly all of the Core Python standard library modules. (CPython is the C implementation of the Python language.) Jython 2.5 uses the same regression test suite as CPython, with some minor modifications.
Are there any plans to support Python 3? If so, when is it scheduled to be released?
Python 3 is still WAY to early for the community, people are waiting for it to be a bit more wide spread.
Why ask here when you can ask the real jython guys who are doing the hard work on the real jython site ???
Jython roadmap is definitely outdated.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:
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.