Diary Of The DevZ
DayZ is going to be a game and like many games, it needs developers. And they like making videos, since, you know, have to throw a bone to the community now and then.
Well, kind of the main point of the gameplay video is, apparently, making the world load only stuff that is near the player - since there are so many items and zombies (especially zombies) around the world, this is a way to reduce requirements on the users' computers. And if you can get through the accent (and non-gamplay footage that follows), we'd be glad to hear about the other stuff!
Hopefully DayZ is one of the last outposts of the zombie phenomenon and we're moving into a new, preferably cyberpunk (though most likely steampunk) cycle of video game dev zeitgeist.