I'm really excited for this game, I have my worries tho.
Steam has currently issues with people setting up listen servers(meaning people can only create lan servers) unless of course you pay for a monthly server.
so if me and my freinds want to play online would we have to buy a dedicated server to get any sort of multilayer service at all?
Also
Getting a good server with people who know what there doing May be near impossible.
I can imagine if I only have 1 friend online trying to find another helpful team mate could be very very annoying.
also We haven't seen much from the Zombie side of game play yet either
which leads me to my next problem. are people going to fight to not play as the zombies?
I know I personally don't care which side I'm on but I've noticed on other games such as "zombie panic source" people have quit because there forced onto the zombie side.
Also I want this game to be kinda difficult I don't want everyone to finish it with the first days e.g. portal. If I'm given infinite respawns and a bucket load of ammo to waste, the tension and fight for survival could just end up a joke. Unless the AI is incredible but from recent years AI has been anything but incredible
and it could just turn into average shoot em up featuring zombies.
Other then that

Im looking forward to this game a lot!