If MechWarrior 5 is a success, I could see MS acquiring Piranha and releasing future Mech series games as Windows/Xbox exclusives.
They should, Microsoft owns the Mech IPs but licensed it out to Piranha, no Switch/Playstation release allowed which makes me want to ask the question, should I include MechWarrior 5 on the Microsoft Prediction League for 2019?
On the topic of purchases, Piranha and Bluepoint would be good purchases Imo, Bluepoint like you said is in Texas and there's been rumours of a Texas studio, It'd be cool if they did original IP alongside remakes. Piranha is also located in Vancouver right next to The Coalition, and there was also rumours of a Vancouver studio a few months back. So I'm going to predict that Piranha and Bluepoint will be the next two purchases.
We know it's not Insomniac, Shinobi confirmed it's not Ready at Dawn and I can't see Microsoft buying Quantic Dreams with their ongoing legal issues.