Crackdown 2 features 4-player co-op, 16-player online

Details posted to Xbox.com reveal that Ruffian Games' sequel to Crackdown --
the sleeper open-world, super-powered crime fighting game -- will
feature cooperative four-player gameplay. The original game featured
two-player, drop-in, drop-out co-op. Also noted: 16-player online
multiplayer -- though not confirmed, this is presumably competitive and
team-based. If you haven't done it yet, watch the official reveal trailer.