The first posting of the roadmap is available here.
You can see the update on Brian Harry's blog here: http://blogs.msdn.com/bharry/archive/2007/04/05/update-on-team-foundation-server-roadmap.aspx.
There are some good aspects being added to the roadmap, like the web access power tool. Some nice items have already made the local CTP's. There are a few things that got cut, like installation on a domain controller.