I've just made version 2.0.0-RC1 of the DataNucleus App Engine plugin available for download. Major features include:
JPA 2 support
JDO 3 support
Unowned relationships

We've also got zads (yes, zads) of bugfixes:

A few words of (extreme) caution:
This is not a drop-in replacement for the version of the plugin that ships with the App Engine SDK. You'll need to update your JPA/JDO config files and you may notice that non-transactional writes now execute right away. A detailed list of the meaningful changes can be found at http://code.google.com/p/datanucleus-appengine/source/browse/trunk/V2_NOTES.txt. We'll get these notes polished and published as we get closer to an official release.

If you're feeling brave please try it out, provide feedback on the GAE Java group, and file bugs in the dedicated issue tracker.

GAE Java group:
Dedicated issue tracker (please include a reproducible testcase!):

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