Eh, they're kinda sorta friends with Sony now . . . Wait, hasn't he already said that he hates Microsoft? From an independent game developer standpoint, Microsoft + Xbox 360 is rated one of the least friendly to deal with. The Super Meat Boy developers said they will never work with Microsoft again. Also, Microsoft refuses to allow an Xbox LIVE Arcade game to be published unless it's release before or at the same time as it is on PSN.
I'm all for Half-life being on the wii u. I bet quite a few 360 and PS3 games will be ported over to the wii u.
--- Update ---
Someone hasn't heard of "
Valve Time."