No. Because a bigger battery would mean a thicker laptop, and Apple has an asinine obsession for thinnes...
We have the proof of this with iPhone and iPad....they made them so thin that they had to have a butt ugly protruding camera and a battery that is pathetically smaller than the competition, just because they could say "we made it thinner!"
I think at last they understood and stopped this nonsense the iPhone 7 and the new iPad are not thinner than their predecessors. Hope it will be the same with laptops, at least the MBP...
And the thinness is desirable in a laptop. Laptop. These things are what you carry around. I want it to be thin.
The evidence is clear. What did they say the reason for no 32GB of RAM? Would that be a bigger impact than putting in a GTX 1080?
Thinness might be another factor. But it is not because of USB-C.