And for a second time, I revive this thread, mostly to point out that the images seem to be broken. To me, it doesnt make much sense for any of the three sections of te Ubiquitous Number to be the height of the player/camera except for 55. Unless I have a misconception in the size of the coordinates intervals, those other numbers would require being stupidly far out of the map. The only thing I can think of being able to see that high up would be to see the large Y shape created by the highways, as shown by Imppa (I think). Because Scat found the number used previous to ODST, it might be possible that Bungie isn't telling us about something new, but warning us that we forgot something previously. What if there was something awesome in Halo 3? The incessant appearances of the number is a pretty apparent plea for attention, but a plea for what?
EDIT: If yore not buying that Halo 3 stuff, let me point out that the first section is 55, and there are five plinths. Could be something.