Walkers nor loot bags spawn, Local chat is dead, you can't interact with storage items (backpacks etc), you can open containers (furnaces, chests) and you can break everything with your hand.
I'm sure there's more going on, but this is what I've found in roughly 5 minutes of playing on TMD-6
I'm sure there's more going on, but this is what I've found in roughly 5 minutes of playing on TMD-6