I guess you already saw these leaked photos...
https://www.macrumors.com/2016/05/31/macbook-pro-leaked-photos-oled-touch-panel/
What comes into my mind is the following:
- I'm glad I decided for the 2015 rMBP, but mainly for design aspects
- it's likely that the glowing Apple logo is gone
- SD card slot gone - I use CF cards, but still surprising as they are slightly thinner than usb 3.1
- no MagSafe - this is sad, one of the best inventions of Apple
- TouchID Bar - although the concept is interesting, it looks horrible, what nobody noticed or seems to have considered is that the TouchID Bar has Force Touch / 3D Touch built in and, thus, emulating the click of a physical key. Maybe in a few years the physical keyboard as we know it today is completely gone.