I think Microsoft is done with the acquisitions for the time being. Right now they have a strong enough case to not being a monopolistic enterprise that they will probably not run into anti trust problems.
I'm guessing nothing Major , just small ones like IOI interactive is fine I think? They are making Project Dragon exclusive to Xbox, and they make the Hitman series.
Cute and honest Sega Saturn fan, also noone should buy Sega grrrr, Sega for life.