I checked out the sample projected in 1080p at about 12 feet diagonally and it looked fine.
There is indeed an improvement in the jump from 720p to 1080p but not as much as there is from 480p to 720p. There's the law of diminishing returns in effect from that point on and 720p is usually more than adequate, even at ridiculous sizes.
But, yes, back to the subject of this topic. I'm very eager for this project to come to fruition. Been waiting for those promised screenshots for a while now!