2 simple things...
1) this game looks absolutely immense, tbh I looked at the screenshots and practicaly made a mess in my pants (excuse the crude humour)
2) on the other hand, one thing the game needs is... more zombies.
not in number, in variance... a couple of differant female zombies, zombie cops, zombies with less white shirts, maybe a zombie hobo (for kicks), a hippy zombie, a millitary zombie, a biker zombie, a zombie nun or 2 (if you want to be really messed up lol) etc...
its in a city right? so there could be thousands of people from all different walks of life not just men in white or yellow shirts... more variance in the hordes of undead would look a lot nicer and a lot less tedious and give a lot more freedom to multi posed deaths as well.
and for comedy value you could always add a zombie gimp.
apart from that one point though, this game looks intense, creepy and a hell of a lot of fun and if you have a wider selection of zombies to throw into the fray i could honestly play it for hours every day for the next god knows how long (especialy with multi play)
ps. check the silent hill sprites I made... I was inspired by this game to make my own horror shooter on xp and them sprites are some of the current result... thanks dude.