Crackdown 2's product page on Xbox.com has a few more details on the game not disclosed when it was first unveiled at Microsoft's E3 press conference. Exciting details.
Apparently the game will allow for up to 16 players in multiplayer, which is nice, but it will also feature 4-player co-op. Which is nicer. Of course, how it'll allow for 4-player co-op is anyone's guess. And an Xbox.com product page can't be relied on as gospel, especially so far out from the game's release. But still, looks promising!