First round of installer/updater fixes is in. This puts the BuddyPress menu in the Network Admin area on Multisite, and keeps it where it is under dashboard on single-site. It also tricks the installer/updater in a few ways that I was having issues with it trying to work with WP trunk.
A few plugins you may want to install and try to help with this:
Debug Bar: http://plugins.svn.wordpress.org/debug-bar/trunk
Log Deprecated Notices: http://plugins.svn.wordpress.org/log-deprecated-notices/trunk
I know there was a ticket or two on this and I’m a bad leader for skipping over them. I’m going to be updating BP.org and profiles.wordpress.org sometime this weekend, so expect some downtime.