Nelson hasn’t confirmed if he is using Unreal 4 or not, he was just testing.
Footsteps - going to assume you mean footprints here, but yeah, these could only be visible in snowy maps.
Normal Modding - What?
New Objects - That’s a given, obviously there are going to be new objects made.
More Animals - Depending on the location of the map (most probably PEI) we could see some cool animals like foxes perhaps.
Clever Zombies - Yep. Zombie AI as of now is pityful, just run out of a city, wait for them to turn around and smack them in the back of the head with a rake.
I assumed that too. I was also thinking vehicles could do something similar in snow, and maybe footprints / tire prints also appear for a bit after going from water to sand?