The game will be based on Mad Max: Fury Road, which Miller had been working on in 2003 before the war in Iraq meant the project was put on hold--due to a variety of reasons, including the American dollar "crashing" against the Aussie dollar. Now, the plan is to release the movie alongside the game--which will not star the original Mad Max, Mel Gibson. There aren't many details of the game as yet, except that it will feature vehicles, melee weapons, and projectile weapons.
http://www.gamespot.com/news/6187715.html