These bits are what we internally call "RC0" and include most of the OM changes that we planned on making post Jan CTP (the Go-Live release).
The bits are not as baked quality-wise as the Go-Live release (they were cut right after about a month of DCR's were coded into the product) but they look alot closer to the final product.
Pointers below...
WinFX Runtime Components:
Windows SDK:
Microsoft Visual Studio Code Name "Orcas" Community Technology Preview - Development Tools for WinFX® (aka Fidalgo):
VS Extensions for WorkFlow:
WinFX RC February CTP "Readme":