Considering graphics of unveiled games like Forza 5 and RYSE and 68GB/s bandwidth of DDR3 Ram suggest that this rumours are not going to happen.
It seems like you could have picked better examples to pick on cause both those games have pretty great gfx. Maybe Titanfall and DR3 or something?
Just a little odd.
But yeah I find these seemingly constant rumors of secret power in the Xbox amusing.
At this point given the recent modest upclocks I'm pretty happy with the thing. It says something good to me that MS cares enough to bother with those upclocks, too (even if it may just be to avoid falling out of porting range of PS4). If they were being stupid they could have pulled a Nintendo and said "we just dont care about the power of the box at all" and done absolutely nothing.
I mean when the downclock rumors were swirling I said I thought the XB1 was a good box I would be satisfied with, at 1.2TF, but anything less I thought started to get dicey. Now they've gone ahead and actually bumped it up a little, cant complain.
I really wish they'd tried to bump the GPU up a little more, to 900(+), but oh well. I mean I always want more.
At the height of the rumor daze I heard MS supposedly had 1Ghz GPU, 12GB Xbox One prototypes laying around. No idea if true, but that would have been best possible!
I continue to find the timing of the reveals these little clock boosts interesting. I honestly wonder if they release these when they think it's too late for Sony to respond.
Late edit: In recent weeks we have seen a apparent drastic increase in ESRAM bandwidth along with these other two increases. Not too shabby from a holistic perspective.