Here's some information that should make for some noise around the Internet:

"Microsoft is excited to deliver a feature complete CTP during the Heroes Happen Here launch wave and a release candidate (RC) in Q2 calendar year 2008, with final Release to manufacturing (RTM) of SQL Server 2008 expected in Q3. Our goal is to deliver the highest quality product possible and we simply want to use the time to meet the high bar that you, our customers, expect."