Update Feb 9th 2018 V0.0.9d
It was a 150 years since the Zombies first appeared. At 50 yrs in, People were finally starting to band together to counter the threat. 50yrs later humanity was finally starting to make a comeback..or so we thought!
The Expansion pack is meant to be viewed, as the name implies, as an expansion pack for the game. What this means is that it adds a bunch of new features to the game without dramatically changing the overall vanilla gameplay experience. Great if you're happy with 7DTD but just want to have more stuff to do.