Some bugfixes are made between v0.11.4 and v0.12.1 see:
Among other things: django-dbtemplates and django-tools would be updated.
To update use ./upgrade_pylucid_env.sh:
- update first only "PyLucid"
- call again to "update all"
Please Note: The django1.4 branch is coming. So you can also wait a little bit and made a update to this changes...