Played a bit more today in the daylight...
The problem I see is that it will just become a huge PvP map - already a lot of that going on. You stalk around for ages killing and avoiding zombies only to be killed by another player because they want your water. I can see it will be popular, but this one is not for me.
It is very well presented though I would encourage everyone to try it.
ASUS P6X58D-E - Intel Core i7 930 - Thermaltake FRIO - 12GB Corsair (6x2G CMD12GX3M6A1600C8) - Corsair AX1200 - 2GB Sapphire Radeon HD5970 OC - 256Gb Crucial SSD - X-Fi Titanium Fatal1ty Pro - Silverstone Fortress FT02R-W