Windows Server 2008 has gone into the final test stages: Escrow. If all goes well it is expected the RTM build bits to be delivered on January 16th. After that all the teams working on Windows have to "sign off" the build (till Jan 23rd)
The week after that there will be "media verification" whatever that may be and then the Release To Manufacturing on February 6th.
We already know Windows Server 2008 build is in sync with Windows Vista Service Pack 1, so do the math.
February 27th is the worldwide launch of Windows Server 2008 together with Visual Studio 2008 and SQL Server 2008 in Los Angeles. There will be launch events around that day all over the world.
SQL Server 2008 has not yet RTMed yet on its launch day!
WSUS 3.0 sp1 can be expected in this time frame too.