My Zero Pro arrived today (Monday), ordered from CPC Farnell on Friday... before I was aware of the Arduino camp split!
cpc.farnell.com/arduino/a000104/arduino-zero-pro-eval-board/dp/SC13792
It has the grey headers, and Arduino.org info on back.
Now I just have to work out the best path to use it - go back from 1.6.2 to 1.5.8 or try to use it in Atmel Studio 6.2 ???