Score three for me on Playstation 3 betas, as I just got an invite into the Killzone 2 Beta ... and I never even signed up (or known about it, honestly) like I did for LittleBigPlanet or Resistance 2. Can't say how it is yet, as I won't be with my PS3 until later tonight, and even then the download will probably take a few hours.
All I can say right now is that I'm pretty excited. Killzone 2 has me interested right now mainly because it seems to be the title that will really push the PS3's graphics power, and I want to see that for myself, on my own TV. We'll hopefully find out if it's the real deal later tonight and/or tomorrow.