I think you can expect some major improvements in GPU speed with this combo, even though the 650M is similar to the 750M. The Iris Pro CPU included is 45 watts, just like before. However, more of the die area is reserved for graphics than before. So, I'd estimate that it is actually 30-35 watts with the CPU going on full and the iGPU at idle. That gives a lot of extra headroom for overclocking the 750M. I'm expecting some pretty impressive benchmark numbers when people get them.