No, that is the C++ team blog and talks about the CRT from 2012 being made to run on XP, which it doesn't at the moment due to it taking reliance on Vista+ platform APIs. This has nothing to do with .NET.
Its interesting to see where MS diverts from this; WP7 and Windows 8. WP7 and Windows 8 are both responses to disruption from iOS and Android.
With WP7 Microsoft jettisoned compatibility with Windows Mobile phones (which had been somewhat popular in enterprise) and with Windows 8, they introduce a radically different UI.
The thing to understand about Microsoft is that its customers are OEMs and Enterprise first, and end-users somewhere in the distance.
That said, all this means is that VS 2012 will target the .NET runtime which will continue to run on XP.