Back in June I posted information from the newgroup regarding VSTS Pricing.
Here's an update from Ajay Sudan's newsgroup post (Jan. 24, 2005).
MSDN Universal customers may migrate to their choice of
Visual Studio Team Architect Edition, Visual Studio Team
Developer Edition, or Visual Studio Team Test Edition at
no additional cost for the duration of their MSDN
MSDN Universal customers may also elect to migrate to
Visual Studio Team Suite at an additional cost. Detailed
pricing/licensing for Visual Studio Team System will be
announced in early March.