I think the biggest upgrade for next year's 15 inch rMBP will be the discrete GPU. I hope it is much more powerful than the 650, to cure any hiccups the computer has in driving the retina display. What do you guys think the successor will be?, 680MX? The cpu side performance, won't be a huge gain. Not sure if Haskell will bring in DDR4 memory, which will also help in terms of performance, but I am already getting around 11000 on the 32 bit geek bench for the base rMBP. The bottleneck of this year's 15 retina is the GPU. What are the chances that next year's dGPU will drive the retina flawlessly and not just alleviate minor lag and stability issues, but cure them?