As for the fretboard: Seems like the busy guys at HMS just copied the specs from the satin version to the Deluxe model by mistake (the spec sheet quoted by Johnson also says "Satin finish" erroneously). So I would assume that the fretboard on the MGCDP is in fact Ebony, just like on all the other Deluxe models. At least, that's what it says on the Ko'olau/Pono homepage:
http://koolauukulele.com/pono-f-a-q/
L
However, they tend to change specs from time to time, so the pictures you see online might not always be an accurate representation of what you'll get. For instance, they have been using different tuners, and the faceplate on some more recent models looks like Mango or Acacia rather than Rosewood or Ebony.
Best thing to do would be to ask the guys at HMS. They can tell you about the features of their present run and explain tonal differences.