Yesterday, Microsoft released the July Community Technical Preview (CTP) for SQL Server 2008. The release makes available several performance and feature enhancements designed to support mission-critical platform and enable pervasive insight across the enterprise. (ok, those last two sentences weren’t mine :)
Check out http://www.microsoft.com/sql/prodinfo/futureversion/default.mspx for all of the latest info. You can download the SQL Server 2008 July CTP at: http://connect.microsoft.com/sqlserver/
Thanks and have fun!