Killzone 2 was definitely a very enjoyable game. Once I took the time to sit down and give the campaign a go, I realized how quickly the game was able to addict me.
It is without a doubt that the graphics will be stunning in this game. Killzone 2's were, and I expect Killzone 3's will be even more spectacular.
I'm rather intrigued about the "escaping from the Helghan". I think the change will be great, as, while Killzone 2 was all about going in guns blazing, this game will perhaps have a different approach. Objectives will likely be significantly different in this title considering the goal this time around.
Thanks for more great information, Caspa.