Interesting, would be nice to see a new GB or Massdrop with this updated layout. Appears to be mostly done although I am curious about cooling the 'high power' smd led, I feel like the brightness required to properly light a whole keyboard is going to need some kind of passive heatsink.
Edit: Looks like the LED specified in the parts list is mounted in a ceramic housing and that is all it needs and it appears to be plenty bright to light a half keyboard per LED. Very interesting.