Here's some sttaus update :
1) There's fair amount of sounds need to be done. We're using same guys who did among other things sound effects for Call of Duty, so they're working on new sounds, dropping them into game, etc. Our plan to finish this process around first week of October. I'm sure there'll be some back and forths, but this is basically no risk item on our list.
2) Animations tweaks, creating new anims. Right now anims are around 60% done. I don't think they all will be 100% done by October, but I don't think what will be left is game breaking either.
3) Zombie's AI tweaking. This is ongoing process, ie changing one stat in database can completely change how they behave. Lots of tweaks will be done by mid october, but still I'm sure that even more tweaks will be done based on feedback from our community after game is open for public.
As for everything else - I think game is stable and polished enough to be released if above issues will be addressed.