Looks good, been waiting a few things on Youtube.
The Witches will walk around when it's day time and not just always sit there crying. What's awesome, because if you hear one, you can't go shooting into a load of Zombies like rambo, because she might be in there. Also there's this 'Charger' Zombie, who moves really fast, and when attacks: smacked everyone over and grabs the last player around the head. What I thought was kinda funny. And more guns!! I always felt Left4Dead was lacking in guns. Woot yay!