@evildictaitor: You clearly do not understand the issue at hand. Please try not to post about things you have no idea about.
What we are complaining about is being able to compile C++11 (<thread> and others, ranged based for loop, etc.) code to into binaries that run on XP SP3 and above. While you can use the VC10 compiler from VC11, this does NOT allow you to use the new C++11 features (which the whole point of VC11 for many of us).
In other words, multi-targeting is useless for what we want.