If Intel and Apple manage to supercharge the Iris Pro so that it at least matches the GT650m in last years rMBP, then I'll be happy with the iGPU solution. If however, they use the standard Iris Pro that has already been benchmarked - I want a dGPU. There should be NO regression in performance in a newer computer. Whether the regression in performance be in benchmarks, games or day-to-day to use is irrelevant.
A newer computer should be a faster computer - across the board (and if that isn't possible, it should at least match the previous generation).
Sure. When you'll purchase the new 15" rMBP and taste how bitter is the reality without a decent GPU, you'll end up justifying Apple's decisions and looking desperately for mass approval in this forum in order to find some atoms of sweetness under your tongue... Lol