Why would you want a 740 when you can have the Iris Pro?
Because the 740 is faster than the Iris Pro, and why care about a 740 when you could have a 750m?
The current rMBP houses a dGPU (as some of you might forget) so it is build to house one, so why not implement one instead of going to the drawing boards again and change the brand new rMBP again for a new internal design?
Why would you want an Iris Pro when you can have a dedicated GPU may I ask? To achieve 14 hours of battery life instead of 11 hours? Who cares??
My current Windows laptop which I eagerly want to replace by a MBP only achieved 2 hours 30 minutes at it's best when it was new, now it only manages to get 1 hour. And I'm not proclaiming some "my laptop story" since most of the competition (even today) only manages to achieve a couple of hours. Macbook owners are spoiled with their +7 hours of battery life which is already an amazing feat.
The MBA's went from 7 hours to 12 hours ONLY by changing the CPU from Ivy Bridge to Haswell. No dGPU was left out since the previous model didn't have a dGPU as well. The current rMBP achieves 7 hours (as the pre-Haswell MBA did) so it's very likely the Haswell rMBP would achieve 11 hours by only changing the CPU from Ivy Bridge to Haswell. Then something most of you forget: Nvidia optimized their dGPU's too! It's not only Intel who became more power efficient you know. The new GT750m (a worthy runner-up for the current GT650m) has a TDP against 40W and the current 650m has a TDP of 45W.
To conclude: Haswell + GT750m would still be able to achieve more than 11 hours of battery life, maybe 12 hours who knows? Especially since Mavericks will be optimized as well. We're talking about more than 11 hours people
I really don't understand all you Iris-Pro-fanboys, I really don't.
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