Re: BP Development Pre-Merge: WP or WPMU
1. BP trunk already supports 2.9.1, and 1.2 will as well.
2. BP trunk works very well on WordPress 2.9.1 (not MU)
3. Don’t expect WP3.0 until at least June, if not later. The WordPress dev cycle is aiming for new versions every six months.
r-a-y’s been paying attention. 
I would recommend staying away from the trunk version of WordPress (single) at the moment. The WPMU trunk currently contains the most up to date WPMU 2.9.1 version, it just hasn’t been officially released yet.
