What features of .net 4.5 do you need?
The features that I personally need are beside the point of this discussion. One person (or company) does not matter to Microsoft in the large scheme of things.
But if you must know, I mostly want to not get stuck on an old IDE. I cannot upgrade to Visual Studio 2012 because it requires .net 4.5.
I also would like to use the non-CTP version of Async and Await.