We are in the middle of building the Fabrik 3.3 release, which has the fixes necessary to run on Joomla 3.4. We hit a few snags with getting new translations merged from Transifex, which has delayed the release a little. The current github works well with J! 3.4, so if you badly need to update Joomla before we get 3.3 out, you can do use the github code (see the Wiki for details on how to do a github update).