You start out in the Stone age (from 200,000 years back - Dinosaurs, and other creatures live and battle alongside and against Man in the Wildman universe) and progress through the eras, looting Technology, Items & Weapons from defeated tribes/camps, kingdoms, etc and shape your own path (your character and your army) throughout history in a large seamless open environment.
Chris Taylor talks about HTML5/WebGL and how this is how "Project mercury" aka the infinite desktop works. Demonstration included.