Anything is possible, but there is no indication that it'll happen. The rumors of a 14" MB or MBP (as well as 16" MBP) are completely unsubstantiated at this point and were created solely by wishful thinkers. I'd think that it would be far more likely for Apple to shrink the bezels and overall dimensions of the MBP in order to make a smaller machine, while keeping the same exact screen sizes. The current rumors that are being reported by MR and others say that Apple will soon introduce thin 13" and 15" notebooks, which gives credence to this idea.
With that said, I would absolutely LOVE a 16" MBP, so I would certainly be happy if they bumped up the screen sizes an inch. However, I don't want an InfinityEdge display and I doubt we will get them. The InfinityEdge displays are not very elegant in my opinion and lead to design and function issues. The XPS really shows this. You have super thin bezels on the top and sides, with a super thick, chunky bezel on the bottom. It's just not symmetrical and looks like bad design to me. Also, in order to get that top bezel so thin, they had to relocate the webcam down to the bottom bezel on the left. This was just a horrible design choice based 100% on form rather than function. I don't think Apple would be stupid enough to follow Dell in adding NostrilCam into their notebook. Thinner bezels? Yes, why not? Bring it on. I just don't want to see them razor thin for the aforementioned reasons.