Visual Studio 2010 Beta 1 was made available to MSDN subscribers to download yesterday and will be available to the non-subscribers (general public) tomorrow. There are many cool new features in the different team editions of Visual Studio. If you are looking at the tools and have any questions (or answers) be sure to visit the Visual Studio 2010 forums on MSDN, you should get answers to your questions very quickly there:
http://social.msdn.microsoft.com/Forums/en-US/category/vstsprerelease