Seb Downie, QA Manager at Guerrilla Games, recently clarified some of the speculation regarding the Killzone 2 closed beta.
Killzone is apparently in "Online Beta Phase 2 of 3," which means it "is still closed and not yet public." Also, the closed beta is only available in Europe at the moment, but a U.S. beta will follow at an undisclosed time.
Luckily for those who aren't currently accepted, leaked footage isn't in short supply. We've found yet another lengthy beta video that's slipped onto the internet, though the second half seems to be a plug for the video's music more than anything else. Enjoy.