I am still undecided between MBA 13", MBPr 13" or MBPr15" but i think i am not the only one in this case.
About the debate "dGPU or not dGPU", I prefer having an homogeneous machine without a dGPU and losing a bit in the game side, because it optimize battery life, heat dissipation and noise. Moreover it facilitate the support of the machine, without needing some tweeks like Mavericks to improve battery life by switching between the dGpu and iGpu. That's my 2 cents thought.
Hope the new MBPr will be out soon.
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You stated that a dGPU wouldn't optimize battery life. This isn't true. Battery life only goes down when the dGPU kicks in on-the-fly, and that only happens when the system decides that the dGPU is the better choice. There are also third-party utilities (e.g., gfxCardStatus) that let you override the system and force it to use the dGPU or iGPU exclusively, if you so wish. So having a dGPU simply gives you more choices, which is especially great when you're using your laptop plugged in. It does not necessarily mean your battery life will suffer.
Heat dissipation on the Retina 15" is excellent--as in the best I've ever owned on any 15" Apple laptop since they started making the cases out of metal (going back to the original AlBooks and TiBooks). The fans are also the quietest, even when running at 6k.