ok here is what i can say,
MCTS (Microsoft Certified Technology Specialist) is the single Cert standard now
(71-620) Windows Vista: Configuration certification
2 paths form there
MCITP: Consumer Support Technician
MCITP: Enterprise Support Technician
Microsoft Certified IT Professional (MCITP) consists of the base MCTS test and 2 MCITP tests. If you are a MCDST there will be an upgrade test (71-621)
so to anwser your question Stoic is no, there is no direct path from the old certs, nothing really lines up evenly
you can find more info here on upcoming tests and certs.
http://blogs.msdn.com/trika/Betas for Vista tests and office tests have started and those of you who are MCPs should be able to sign up for those beta tests (still costs money though!!!) and get ahead of the curve. if you pass the beta test you gain the certification