A new "platform" for Microsoft and others (instagram was highlighted too) to integrate their services into Cyanogen Android. This is quite exciting for the Android platform and could open potential new monetization mechanisms beyond the appstore.
Of course, there is a king-of-the-hill situation running here with Cyanogen business deals controlling the experience and not really what the user wants.
P.S. I also want to take a moment and appreciate how open the Android platform really is to make this a simple possibility, let alone a possibility.