Honestly I'm still hopping for Apple to do something drastic about their GPU situation, with AMD and Nvidia barely offering compatible cards in the lifetime of a Mac Pro, that maybe Apple should develop their own GPU based on PowerVR series6.
You're kidding, right? Intel tried to make a forray into the discrete GPU market and couldn't get past square one. Look up Intel Larrabee.
This is INTEL we're talking about. Aside from the current big 2 names in the market, who ELSE would you guess could pull this off. Right out of the gates with chip engineers, fab plants, experience in basic onboard 3D concepts, etc. It was LAUGHABLE and a failure.
Apple isn't a divine, reality-bending company just because they have snazzy case designers and love them some software integration. They could not do this. They could go for 10 years before they come close to offering what Intel already gives in their new onboard chips.