This version of the game adds Outpost Attacks! Each outpost will be attacked once per day randomly in either of these time slots: 12pm UTC, 9pm UTC or 1am UTC. When an outpost is under attack you'll hear a siren and looking at the map will highlight the relevant outpost in Orange. The attack lasts for 30 minutes, and during that time everyone online will need to work together to keep the main doors from being broken down by the infected. If the battle is lost, that outpost will be overrun for one hour and handing in missions will not be possible. If the doors are properly defended, then everybody who took part will get a 2 hour boost to EXP and loot rates. Note that zombies killed during an OA grant more EXP than they normally would.
It's important to stress that the outcome of the battle is global, which means the result is the same for everyone regardless of whether you play solo, lobbies, MMO mode, or which server you play on. You will notice the doors sometimes taking damage even when you do not see zombies hitting it in your game, this is because other players in other instances are not doing their job!
Unfortunately I ran out of time, and did not manage to implement rooftops as I had planned (although I am still aiming to add them in a future update). I should also note that this system has only had light testing with a few people and the balance may be totally off. The first few OAs are likely to be either way too hard, or way too easy. It will no doubt take several days/weeks of fine tuning based on your feedback to get right =)
Other changes:
NOTE: You may need to exit out of Steam and log back in to get this update.
P.S The first OA happens just under 3 hours from now at 1pm UTC. I don't know which outpost it will be :)