For reasons none of us can understand however they're no doubt sticking with ATI, which makes precisely zero sense. ATI's desktop parts are a generation behind NVidia at the minimum, and their laptop parts are an utter joke.
In the case of the new rMBP it seems to because they're targeting a new, even lower power envelope. The current rMBP has ~50W chips, the rumoured Polaris chip only has 35W. Chances are that we can thank Ive's obsession with thin devices for that.
Nvidia currently doesn't offer anything with Pascal in that power-range.
I'd like a 17" rMBP with a GTX1070. 6 core mobile Xenon, 4k display, large heatsinks, large battery, large keyboard, great speakers.
Make it absurdly expensive just like the large desktop replacement Powerbooks were back then. $5000-6000.
I'd have no problem paying that because I'd keep the machine for 4 years and it would be worth it to me.
Realistically I'll settle with a pointlessly thin redesigned 15" rMBP with an iGPU only and spend the extra money on a Hackintosh because the dinky low-TDP Polaris chip won't even be in the same ballpark as what was announced today, not to mentioned AMD driver support if you can call it that.
At least there's some hope that the iMacs get the new mobile Pascal.
What's the TDP of the M395X, surely it is close to the 100-120W of the GTX1080? Wasn't there a job offer floating around recently where Nvidia was looking for programmers with Apple experience for future products?
The only thing that can change their GPU focus in the future would be if VR takes off and Apple would loose market because of negligence - Because this is one area I think Apple consider important.
Sadly no, Cook already stated that they don't think VR is very important.
They do consider AR (augmented reality) a "core area of research" but that has nothing to do with the Macs and everything to do with the iPhone/iPad and iCar windscreen.