BuddyPress 1.8.1 is now available. This is a maintenance release, which features improved compatibility with WordPress 3.6, as well as fixes for some RSS feeds, the
meta_query parameters in the Groups and Activity template loops, and the Groups Extension API. A complete list of closed tickets can be found at the 1.8.1 milestone, and a full changelog is at http://codex.buddypress.org/developer/releases/version-1-8-1/.
This is a recommended update for all installations of BuddyPress 1.5+.
Upgrade via your WordPress Dashboard > Updates. You can also download the latest version at http://wordpress.org/plugins/buddypress.