SQL Server 2012 has now been released to manufacturing and is available to try here:
http://www.microsoft.com/sqlserver/en/us/get-sql-server/try-it.aspx
Microsoft have also kindly release a Microsoft Press Book on the new features here in PDF format (epub and mobi formats to follow next week).
I’ll have a quick look and see if there’s anything I can show you soon 🙂