Well ive seen a d800 connected to atomos ninja and i think the ninja showed 1080i50 / 1080PsF25
So Im pretty sure uncompressed hdmi is capable of 1080p25 , but in an interlaced wrapper. I think its highly unlikely that the footage itself is interlaced.
Im also pretty sure that its 8 bit because thats what Nikon said earlier.
well time will tell.....