[Sam Bauers]

The 0.9 release is being compiled in “branches/0.8” of the bbPress subversion repository. Trunk is already heading toward 1.0-beta.

If you want to test 0.9, then grab the files from here (zip download at the bottom)… https://trac.bbpress.org/browser/branches/0.8

BackPress is not used for 0.9