"By compatible I mean if you buy the Anniversary in November, you can transfer I think seven of the maps to Reach"
The remake only includes 7 maps and it is built on Reach's Multiplayer.
If that is the case than I see it being completely pointless to be buying a whole new game to only be able to transfer what is inside of the game to a game that is already out. I do not see that happening. But if you have proof of this I would like to