While I don't have a solid answer for you on that - and it IS a good question.
My push for 1080p and HD discs is not 1080/60p but 1080/24p. The display should have the ability to refresh at a multiple of 24hz. (48, 72, etc.)
As far as I know 1080/60p is not clearly been introduced as a standard within the HD disc category, but I know that 1080/24p is on the books to be a standard, so films will be but onto the discs at their native 24 frames per second and a display potentially may be able to show the film at the original 24 frames.
I think the goal would be for there to currently be a 1080p display that operates at 72hz that does 3:3 pull down. Deinterlaces the frames of a 1080i film, then shows it 3 times in a row.
You just gave me some excellent information actually - thanks! Since 1080i, with film based content, offers 100% of the full image of a 24fps film, then 1080p really does have the ability to show all of a film and 1080/24p just has the ability of utilizing the lower bit rate required to increase the overall film quality.
Thanks!