Halo 3 - Four Player Co-op (?)

As posted over at our sister site 1pstart, it seems while a group digging through the Halo 3 code has found this interesting piece of information:
The game cannot start because all players are set to observer. Too many players for splitscreen. Only 2 players may play splitscreen coop on the same Xbox 360 console. The party size is too large to start the game. Up to 4 players may play coop on Xbox Live or System Link. Loading information from Xbox Live…
Their claims give no doubts that 4 player Co-operative play will be included in in Halo 3. Available both online over Xbox Live and also locally via System link. At the moment, I just want to keep this a rumor and not get all excited over it.
So for now, see the [source] and check for yourself.

July 15th, 2007 at 9:11 am
[...] Player Co-Op, Hell Yes! July 15th, 2007 by PacoDG Starting out as a rumor a couple of months ago (link), this is looking to be soooo near truth right now. So yeah, that was a pre-emptive “Hell [...]