I sense great bitterness here, someone paid too much for DayZ before?
A quick google or reading the linked page or youtube pretty much explains what the new DayZ standalone project is about, what it looks like and what the goals are, so I don't understand the guessing that still goes on about some of the aspects.
And as for the player killing aspect of it, then I thought Rocket didn't really want to artificially cut into this mechanic much. It just shows that people are complete bastards. Although I think that something should and probably is being done to encourage working together more then it just shows that an average person these days is incapable to play any game differently from general running and shooting - whatever the rules or settings.
The measures to force this to play out any differently are probably too great to fluidly fit into the overall mechanic without being too apparent and restrictive.