Josh - when we ship QFEs and SPs, we update all redist mechanisms, including app-local DLLs, MSMs and VCRedist*.exe as part of the patch to Visual Studio.  I believe we will do the same for the MFC update (although, since it is in the future, I can't say with exact certainty that it will be that way, but that's the current plan as far as I know).

-Ben