Jython 2.2 has support for most of Python 2.2 and numerous features from Python 2.3. The new release - the first major overhaul in 4 years - includes many major changes:
* new-style classes
* Java Collections integration
* PEP 302 implementation
* __future__ division
* support for running on JDK1.5 and 1.6
* new installer
* a significant number of features to bring Jython in line with CPython
Compatible with 2.2? Who cares? Given the incompatibilities between 2.3 and 2.4 (let alone 2.2 and 2.4) this makes Jython basically unusable.
JRuby has clearly won the war here in terms of major scripting languages to use with Java and that is too bad.