If you are lucky MSDN Subscriber, you can download VS2010 as well as TFS2010 right now! I already did.
BTW: TFS2010 has "go live" license which means you can use it in your daily work instead of just testing purposes. Here are more details: Brian Keller's blog.
If you don't have the subscription, you just need little wait - it will be available for everyone in October 22nd.