I am willing to make a bet that MS will not be buying or acquiring any publisher or even studio in the next 7 years.
If anything, their focus will shift to what Sony's currently is. Expanding the work fore of the studios they now own. getting their games out as quickly as possible. People need to stop looking at studios as the currency. The real currency is IPs. MS was in dire need for more IPs. Halo, Gears, and Forza can only take you so far. And they needed more talent, if the Halo team isn't cutting it, give the next halo game to the doom team.
Now MS is in a position where they have an IP bank of over 12 - 16 strong IPs. They need to be getting at least 4-6 of them out each year. That's what their current focus needs to be ad will most likely be.
Microsoft has openly stated they aren't done acquiring companies, and we know they've been making overtures toward attempting to acquire Japanese studios too. This isn't stopping here.