This could be an opportunity for AMD considering they ship the GPU for both the new XBox and PS4 and Wii U. But Carmack suspects that MS and Sony won't like it because it could boost Steambox.

https://twitter.com/ID_AA_Carmack/status/383047595725037568

> AMD has an interesting opportunity with Mantle because of their dual console wins, but I doubt Sony and MS will be very helpful.

and

https://twitter.com/ID_AA_Carmack/status/383051142755663872

> Considering the boost Mantle could give to a steambox, MS and Sony may wind up being downright hostile to it.