Preordered earlier today. Played the demo a bit (busy now/sleep soon, but will be on later). It's really neat. It reminds me of alien swarm, although some things are better done and it fits the fist person perspective amazingly well. I like how it's paced, the speeds of the zombies/action, etc. It feels very dynamic, game flows well, animations are very smooth, etc. Also, I love how the zombies seem to pour into an area like a flood of liquid zombie.
Also, the fact that the game is primarily coop makes it so much better. I love coop games, and wish there was more coop in games, especially online coop.
I really like that they expanded upon the dynamic voice clips system that they had in TF2 - it really makes the gameplay feel more alive and dynamic.
My steam ID is JRPereira, although I'll show up as "Mercenary" ingame. I think I may have joined the neogaf steam group already. I tried joining it again earlier just to be sure but either it didn't go through or wasn't showing that I was already in or something.