Seems weird that when AMD and games games consoles have demonstrated that APUs are able to produce (consumer) state of that art 3D graphics that Intel would go in the opposite direction. If anything needs the space, power and heat saving features of an APU it's a laptop. The only reason I look for a laptop with discrete graphics is because I need to program in NVidia's propriety CUDA platform. Then I look for the lowest power dGPU variant. I'd much rather be carrying around a Thinkpad X1 carbon than a Thinkpad X1 Extreme (not that I can afford either).
Yes, I know everyone is different, just talking about the average laptop usecase - a computer you carry around everywhere with you and use away from a power source. Not talking about lug-able workstations.