No official announcement yet, but SP2 for Exchange 2010 is now available.
Some of the new features are Address Book Policies (aka GAL segmentation), OWA Mini for mobile devices and the Hybrid Configuration Wizard for mixed on premise / Office 365 deployments.
More info at the earlier announcement of SP2.
Download: Microsoft Exchange Server 2010 SP2 – Microsoft Download Center – Download Details
Update: the official anouncement: http://blogs.technet.com/b/exchange/archive/2011/12/05/released-exchange-server-2010-sp2.aspx