Sony has issued a statement denying that it has set any release date for Killzone 3. This follows CVG's "source close to the platform holder's European HQ" stating May 2011.The mole close to SCEE also stated that he or she or it had, "been told that there will be vehicles in the online multiplayer - but I haven't seen that for myself yet."
Apparently there is also "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".
For its part, SCEE tells the world, "We've not set a release date for KZ3 at present".
Business as usual then.