That's a huge move as they will now own the likes of Doom, Elder Scrolls, Fallout, Dishonored and Wolfenstein. Hopefully that'll be the end of the shitty Bethesda platform and the dogshit microtransactions. Maybe they'll also have access to better technology instead of clapped-out crap from 15 years ago still.
I can't see these brands suddenly becoming Xbox and Windows Exclusives though as they bring in the dosh on Playstation but it could lead to some shit going forward such as content and platform timed exclusives.
Microsoft buys Skyrim and Fallout company Bethesda | GamesRadar+
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All of ZeniMax Media is becoming part of Xbox