It won't happen anymore. Two/three years ago I would have said that it will happen but there are too many facts which tell us something else:
1. Intel is putting a lot of effort in iGPU and they are quite successful.
2. Slim and light sells better than dGPU
3. Battery life and heat controll can be better optimized with iGPU.
4. dGPU would decrease the margin for Apple. And even if they would raise prices to keep their margin then at least they lose a part of their revenue due to less buyers.
5. dGPU as an option contradicts with the slim design startegy
Any other opinions?
1. Effort yes. Successful depends on your point of view. From an economic point of view, Intel sells a lot of iGPUs and reached a high market share. But from a performance point of view, Intel has not yet reached upper middle class performance (average 23% slower than last year 650m). Their drivers still suck and they plan to release new drivers only quarterly for the Iris series.
2. I posted a logic board comparison a few pages back. The dGPU+ VRAM is already a small piece of hardware. With an iGPU only they could build a smaller heatspreader. All in all there is not much room for improvement. And why should Apple redesign the rMBP after one year?
3. Heat control yes, there would be only one heat source. Battery life is still a big question mark without a side by side comparison. The screen is the biggest battery life eater and Apple uses quad not ULV processors. Iris 5200 pro chips have not a magically low power consumption. I would be really surprised if Apple would achieve the MB Air like battery life gains.
4.Intels product is overpriced compared to the Intel CPU+ dGPU combination. That is why most of the OEM producers decided not to release an Iris 5200 pro product. Apple is a special case, because they have great relations to Intel. Maybe they get it cheaper.
5. Without a total redesign it is only a problem of production lines. Apple likes to keep things simple. But they offered a dGPU as BTO in the past.
Apple could and most likely will offer an iGPU rMBP. But don't expect it to be really great in every way, because Iris 5200 pro is not a magical piece of hardware. For Apple it would be just a way to keep up (or even increase) margins and eliminate some dGPU related problems. That's it.
I still hope, that after this talk about the Mac Pro and that specs matter, Apple decides to offer a dGPU as BTO. Or even better release it with an AMD Crystal mobile card in october. If they choose not offer it, i will buy last years 15'' rMBP. I want a solid performance package to replace my old desktop and my mid 2009 13''.