I think this is a clever move for MS - while I primarily know Deck13 from their P&C adventures phase, first game I've played that they've tried to diversify with was Venetica, not very good game that I liked more for potential than for its execution...haven't got around Lords of the Fallen yet, but overall, they're average developers that might have bright future with MS money.
Honestly, I wouldn't be surprised to see more of this happening - for what it seems to be years now I'm wondering why haven't anyone bought Piranha Bytes, given how small they are, and yet with PC cult classic Gothic IP under their belt (not that I want this to happen, potentially making their future games never coming to PC ).