They already did the exact same thing twice with Halo 2, it's not new, and they will make a lot of money doing it. But give it a few months and that content will be free, they just want to get extra money off the people who can't wait to play it, and since you will miss out on some of the matchmaking games if you don't have it, more will get it even though they would rather wait, just so they don't get stuck playing the same few maps in matchmaking.