I downloaded the halo 3 legandary map map this morning (april 15th). but its not in matchmaking.?

i can play the new legendary map pack on costume games and forge though.

I downloaded the halo 3 legandary map map this morning (april 15th). but its not in matchmaking.?
to play the new maps in matchmaking you'll have to play in the dlc games, they will be mixed in a little into regular matchmaking but i wouldn't expect to see them because everyone in the game would have to have them and then they would have to come up in rotation