Currently I have installed bbpress plugin on my buddypress site. With the 2.0-beta-2 version appear normal, though of course less than perfect. Recently I upgraded to the 2.0-beta-3 version, the forums become disappear.
Just tried to activate the plugin on the sub-blog on the wordpress ms site . Works quite well although there are a few things confusing. Understandably, the plugin has not been released. I will patiently wait.