"In true, "I will neither confirm nor deny" Microsoft fashion, a little bird in Redmond informed me that Pex and Moles will have no further releases, because they are being "productized". Another, larger bird stated, "dependency isolation will be taken care of, in Visual Studio 11," when I asked if Moles and Pex will be rolled into VS11.
The Visual Studio 11 community technical preview (CTP) is available for download to anybody. However, the Moles and Pex products are not yet integrated into the application. There are several points of integration the need to be perfected, before adding it.
Hope this is true... I'd dig to see these projects baked into a release of VS.
BTW, if you're looking for more Pex/Moles info, make sure you check out, Testing with Microsoft Pex & Moles, also by Mike Christian