Yup it basically does. I had a mid 2011 MBA 13.3" and a 2015 MBPR. And the first thing i noticed when i played with the MBR last Friday its basically the same footprint as the 11" MBA. You will deff see the difference in screen size. Granted you can prob adapt. But for now for me, I'm sticking with my 2015 Pro.
Im hoping V2 Apple makes a 14" version with the wrist rest space like the current MBA and MBP 13". I have big paws and my palms already land where the wrist should rest as it is. I think it would be uncomfortable for me with the 12" MBR.
That wrist rest space is value to some people, especially me and i don't travel. So i don't need the absolute lightest smallest footprint. I just can't go under 13"