This is not new information, but worth reiterating now in case people have missed it...
From 13th July this year, Windows 2000 will not receive any further updates, and Windows Server 2003 enters its "extended support" phase which means only applicable security updates will be released for this product.
Microsoft Support Lifecycle
It has also been confirmed that there will not be a Service Pack 3 for Windows Server 2003.
A couple of blogs with more detail:
Windows Server Division Weblog
CSS SQL Server Engineers blog