Although the videos state 2016 it is pushed back until 1st March 2017.
HZD seems to be set on a future Earth where robots rule...but not in the way you'd think. They seem to be animals and mish mashes of beasts. Humans are now tribe like and the old cities are dead hulks and not allowed to go there. Robotic animals live and wander the fields and Aloy..the lead you play is a girl from one of those tribes. She hunts the animals with a special bow that can use energy and such. Easier just to read up on it. Aloy may be from a remnant part of humans still having high tech. Sorta Yor the Hunter From the Future like haha...no dont rent that ugh. Hard to explain.
E3 2015 trailer
20 min game play video
In a lush, vibrant, post-apocalyptic open world, colossal mechanized creatures roam a landscape that they have torn from the grip of mankind.
Human evolution has, over time, regressed to a tribal hunter-gatherer existence, surviving amongst towering forests, imposing mountain ranges and the atmospheric ruins of a bygone civilisation – while the savage machines have become all-powerful.
You are Aloy, a skilled hunter who relies on speed, cunning and agility to stay alive and protect her tribe against the strength, size and raw power of the machines. Against overwhelming odds, you must embark on a compelling, emotional journey to uncover the secrets of a forgotten civilisation, the ancient artifacts they left behind, and to learn more about the advanced technologies that will determine the fate of the planet – and of human life itself.