http://blogs.msdn.com/groove_development_team/archive/2009/04/17/groove-2007-sp2-on-the-horizon.aspx

"Keep an eye peeled for Office Groove 2007 Service Pack 2 – it’s due out very soon.  It’ll include a variety of goodies, including support for SQL 2008 in Groove Manager, a couple of new blocked extensions for improved security, and a fix for currency fields in certain languages, among other things.  Details to follow upon appearance of the new arrival…"

Groove improvements will include improved synch reliability; Groove Manager will install and run with SQL 2008; improved LDAP connectivity and auto-activitation; improved error reporting and reliabilty in the Relay Server.