Aside from a "standard two-player" co-op , we should expect "an objective-based" four-player co-op too. PlayStation Move and 3D confirmed.
"Guerrilla is working on a standard two-player, co-op - as you'd expect - but there's also an objective-based separate four-player co-op mode in the works, too," said 's source. As the May 2011 date is purely internal it could change at any time - salt pinches.
"I've also been told that there will be vehicles in the online multiplayer - but I haven't seen that for myself yet," they blabbed on. We now know already that stereoscopic 3D and PlayStation Move's motion control is fully supported as Sony confirmed it.
Other details like ice levels, jetpacks and multiple firing rocket launchers have all been spilled from theon Killzone 3.