Microsoft released SQL Server 2007 Beta1 CTP earlier today. You can download it here
A ton of new things, support for spatial data. New functions to deal with numeric data (IsInt, IsBigInt, IsSmallInt). Also new is the addition of Natural Join, a bunch of new dynamic management views that make it easier to prevent deadlocks. Another cool thing is the addition of the new BigDateTime datatype, this makes it possible to enter dates before 1753, you can actually go back to -3000. That is such a big plus for databases that deal with data that's older than 1753. What are you waiting for? Download it here now