Prototypes of phones that were really made like closely before sale should have C0 on it. This one is the old N9 HW I think, like the final version.
I guess it wil have the same UI as on images above - because it booted like that. no swipe yet worked. more maemo6 like meego.
we have no dumps of it. this has to be highly internal proto, someone had serious problems for loosing it I believe.