I'm pretty excited for this game, but the narrator bugs me a bit. So many games resort to a narrated tutorial voiced by a disembodied benefactor. There's just always some dude over an intercom who is willing to tell you what to do. It seems to oppose the idea that it is more realistic than other zombie games.
Of course I say that having not played the game, so the early footage could be overplaying that role.
Do the characters you play carry radios? It's not unfathomable for someone to be helping survivors via radio in a situation like that. It'd be even cooler if the radio was an item you could have with you, and you'd only get to hear him if you have it on and with you.