Will Anniversary MP replace Reach MP (ala 3 and ODST)

Quick question: does the Anniversary disc contain all the Reach maps released to date, like ODST did with Halo 3, or just the anniversary maps. If only the anniversary maps, does the game contain a code or another avenue to downloading the maps for play in Reach? I wanted to buy the game but if I’m gonna have to swap discs all the time to play the classic maps I might rethink it…

The disc only contains the Anniversary maps, nothing else. You can download the maps to play them in Reach/

The game does contain a code so you can download the Anniversary maps to use while using the Reach disc.