I read so many conflicting things, most of this talk is beyond me anyways. I'll just have to wait for the announcement, release and tear down then have you guys explain it to me. One thing that is for sure, it'll be a world apart from my 2009 15" duo core MBP, which spends most of its time displaying the rainbow circle of death
integrated graphics will not be as good as current discrete graphics (650M+) for a few years yet. Even Iris Pro will not be close to the 650M. Thereofore, removing the 650M and adding just Iris Pro would result in worse perfomance for the 15", even though up to 100% improvement for the 13".