ARK: Survival Evolved

Multi-player (100+) open-world dinosaur survival game

No zombies yet but there is still time. Sadly it won't appear on Xbox One until 2016. If you can not wait it will be available on early access Steam this June.

As a man or woman stranded naked, freezing and starving on the shores of a mysterious island called ARK, you must hunt, harvest resources, craft items, grow crops, research technologies, and build shelters to withstand the elements. Use your cunning and resources to kill or tame the leviathan dinosaurs and other primeval creatures roaming the land, and team up with or prey on hundreds of other players to survive, dominate... and escape!

Slightly more info at playARK.com