Likely, approximately the same footprint. Remember, it's a 1-2-1 configuration. It looks similar to the 763 seat with a footwell, as opposed to the 777 or A330 seats with ottomans. That implies that perhaps the width is slightly wider than the 763 seats, but the length is just a bit more (I think they said a 78" bed?)

To me, the door seems a bit of a "me too" gimmick. If they were offering "cabins", that would be a different story, but I'm not sure the value of what appears to be a 4-foot high door that will have to remain open during meal services, takeoff and landing (i.e. about 40% of the flight).