We have a beta folks!
Grab it from ftp://ftp.mozilla.org/pub/mozilla.org/webtools/testopia/testopia-2.3-BETA-BUGZILLA-3.4.tar.gz
Usual steps apply. Reverse old patch, untar, apply new patch, checksetup. The only thing to note is the new patch is in extensions/testopia now.
As always, this is a beta which means I would not yet recommend it for production installations. But you can try it out on a test install to see how it will work with your data.
As usual, log bugs that you find at http://bugzilla.mozilla.org
For those that don't want to mess with installing it, you can test it out at http://landfill.mozilla.org/testopia