wolfsrain: Warner is developing their own, too. Check Batman Arkham City and Origins for the rudiments of that.
I wouldn't be surprised if Arkham Knight will launch with Warner's own client...
xSinghx: ...the only publishers not in the DRM platform game are Square Enix ... and Take Two.
Disney?
Kristian: ...Bethesda mostly stayed away from the more draconian forms of DRM.
Oh look, we'll have to choose between the wolf and the hyena. Thanks but neither.
ne_zavarj: I will laugh if Bethesda removes all their games from Steam and force existing customers to redeem their Steam keys on their platform.
They probably can't do that in the near future, because contracts.
But once those expire then it's a possibility