MonoGame replaces it and is available now for Windows 8. In fact I've completed two games using MonoGame which run using 95% the same code on Windows XP, Vista, 7, and 8. Pretty soon there will be a Linux and Android version as well.
If you want to see what's possible you can check them out:
I was looking for an 'official MS technology' replacing it. I know monogame. I wouldn't think anyone NEW to game dev would start with it; it's for XNA devs wanting a life after, right?