Beta1 has been released. You can download the express version at http://lab.msdn.microsoft.com/express/.
I think the biggest thing added in 2005 is the Team System (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvsent/html/vsts-over.asp).
Yeah, looks sweet. Got my C# one here. :)
http://msdn.microsoft.com/subscriptions/downloads/
Visual Studio .NET May CTP (Community Technology Preview) is available for download @ MSDN Subscriber Downloads, if it applies to you.
I might pick it up, I have March, and it really fucked up my help system.
This year is going by way too fast. :P