From Nick and Adrian
The official preparation guide for the exam can now be found at http://www.microsoft.com/learning/exams/70-556.mspx and the official exam is available on Prometric
I can concur with Adrian that the topics are pretty much spot on and that all of the subject areas appear as per the guide.
And congrats to Adrian - though of course we'd expect nothing less ;)
Edit: Don't forget to register for Second shot before you take it! http://www.microsoft.com/learning/mcp/offers/secondshot/default.mspx