WarZ is out, but you have to pay for it
(Beta though)
It looks fun and is fun, I watched my brother play it once and I want to play it
It looks almost like an exact DayZ clone, except missing a shit load of features, zombies walk like retards, and aren't a threat at all.
The only plus I see is that it seems a lot more stable, otherwise DayZ wins by a large large margin.
You cannot even get any vehicles... yet, of course. Perhaps in the future it will get better, it's still beta after-all. But for now I don't think WarZ is really worth the money you pay.