Guerrilla Games showed Killzone 3 in action for the first time tonight at an event in San Francisco, and Joystiq was there. Managing director Hermen Hulst was on hand to lay out some key details about the sequel -- unfortunately, any sort of release date wasn't among them.

Saying that the team was inspired by the ambition exhibited by other Sony Worldwide Studios releases, specifically Uncharted 2 and God of War 3, Hulst detailed planned improvements across the board for Killzone 3. Chief among them is more variety in environments, weapons, vehicles and enemies. Promising more epic, unique moments throughout, he pointed out that the first three minutes of the demo featured more cinematics and scripted events than the entire first level of Killzone 2.

We'll be delivering our full hands-on with the game at noon PDT, but for now you can read on after the break for more on Killzone 3's new environments, weapons and more.