SQL Server 2008 RC0 has been released to the public here. It was released to MSDN and TechNet subscribers late last week, but now everyone can enjoy it.
Also looks like a new Certification has come out as well called the Microsoft Certified Master. This actually looks like a step in between the regular certs and the SQL Certified Architect (SQL Ranger). It requires that you have both the MCITP: DBA and MCITP: Developer and then attend 3 weeks of training, more info here.