According to Netherlands gaming site Xboxworld, Bungie has confirmed that Halo 3 will feature 4-player online co-op, despite theories to the contrary. The news comes from a press conference in Amsterdam, where Frank O'Connor and Brian Jarrard are demoing the game for the press. While we normally wouldn't take translated articles as gospel, Joystiq has learned directly from Bungie that the feature is definitely in the game. Furthermore, an update is expected to hit Bungie.net later today. Stay tuned for the official revelation (in English no less) whenever it drops.
Update: Bungie has now revealed everything about online co-op. Check out the details here.
[Via Joystiq. Thanks to everyone that sent this in]