Fresh from the Microsoft download center:
My friend Marcello has released an Obfuscator called Goliath.NET Obfuscator.
A trial version is available here (only for non commercial uses and limited to 100Kb assemblies).
It costs 229,00€ + VAT. English pages are not yet available, the official site is www.cantelmosoftware.com
I've installed the latest TFS December CTP and here are the build numbers of the two flavours of MSF:
- MSF for Agile Software Development: Build 100
- MSF for CMMI Process Improvement: Build 1.00.0000.00
It seems that we're approaching the final releases, at least considering the build numbers... 
P.s. I've also updated the MSF v4 resources list.