As a huge zombie fan, I'd love the idea of a zombie mod. Perhaps a virus gets sent into the implants of most people, hijacking their nervous system and causing them to go haywire? Or something like that.Please, no more zombie games.. It's been done enough. The only way I would accept a "zombie" mod, is if it's a bunch of cyberpsychos.
Backstory isn't such a big issue. In 2020 you rolled for your lifepath to give you some backstory. I imagine it might have a lot of the same.
On backstory, in the demo on the character creation screen they have one of 27 possible backstories, or lifepaths. It'll most likely affect your story in some way. Possibly a variant of how GW2 or Mass Effect did it? Albeit much more in-depth.