Killzone VIP Dubbedinenglish stated "I asked the Mutha in another thread he replied a no comment... So we'll have to wait and see."
Killzone VIP Ziggypanda stated "I'm pretty sure that Seb said GG won't be attending E3 this year."
It would be impossible if Guerrilla worked on another IP while Killzone 2 is still the center of attention. If anything, we believe some new downloadable content make surface sometime during summer 2009.
I wasn't really expecting them to show up at E3 or at least not to go without any plans to announce anything massive. It wouldn't surprise me if they are at least in the planning stages of a completely new game It seems a bit too soon for them to be announcing another game so soon after Kill Zone 2's release. If they did go to E3 I doubt they would have anything new to show other then possibly another map pack.