Microsoft finally made it official. The next version of SQL Server, which is code-named Katmai, will be called SQL Server 2008. More importantly, they have released the first CTP build, which you can get here.
Microsoft also announced that Visual Studio Orcas will be called Visual Studio 2008. Bob Muglia stated in his TechEd 2007 Keynote that both Windows Server 2008 and Visual Studio 2008 will ship before the end of the year, with SQL Server 2008 shipping in the first half of 2008.