This guy gets it. I travel a lot and I can never unfold my 15" with the seat tray. The new 13" MBP should be more than powerful enough to do what the 15 MBP does (even without a dGPU). The Skylake chips have 40% faster Iris Pro integrated graphics, closing the gap.Only thing that would make me upgrade this time around is quad-core chip in a 13/14" chassis (preferably with a 32GB option). I love my 15" - but it is too damn big to use in most airplane seats.
Needless to say, I've sold my 15" MBP and will be buying the new 13" Skylake MBP for a perfect balance of power vs. mobility.