Weapons, I would honestly like a game that makes you feel helpless with your weapons, I played a game that is isometric like this and quite similar to this, but the "horror" factor soon melted away as I had 4 of my companions with flamethrowers and I have a machine gun with 999 ammo in it with no need to reload.
That sounds like what this game is specifically going against.
shotgun blasty video aside, combat in this game is a complete last resort, you're in grave danger using practically any weapon: Baseball bat, one mistime or too many zombies and all it takes is a scratch. Shotgun: One shot and hundreds of zombies from around the rest of the neighbourhood will be en route to where you are, and you're
never going to have the ammo to deal with all those.
Also you'll have very limited ammo you've salvaged, and can only carry so much. The best solution is
always to avoid the zombies if at all possible. As it would in a real apocalypse.
So there are other NPCs like you who try to survive right? Do you guys compete for resources?
Ultimately a
huge part of the game. While they will not be in the first demo, and will start off simple, it's going to evolve into managing relationships in your group, dealing with trust issues, prejudices, helping people find their missing loved ones, having the clutz who always leaves doors open or makes unnecessary noise (who if you're particularly callous, you may say 'hey let's go and get supplies' then take him up the street and put a bullet in his head, come back and tell the rest he got eaten), the shifty one who got bit but is keeping it secret, the guy on the CB radio you contact and go to track down. Doing trades with, or defending your safe-house from a rival group of survivors.
So yeah, needless to say NPCs are a massive part of the game.
Multiplayer would essentially be the same experience, but there would be multiple human players in the group.