Far Cry Primal available for early digital download, with free bonus game
If you just can't wait to get your hands on a copy of Far Cry Primal, then you're (kind of) in luck. According to Major Nelson, Xbox One users can download their copy of the game before Far Cry Primal's release date of February 23. Obviously, you can't play it until the 23rd, but at least you won't have to wait for anything to play it on the release day.
Naturally, Far Cry Primal comes in two editions, both with their own pre-order bonuses. The normal edition comes with three bonus missions where you drink some shaman's magical mystical shaman juice to get to play as a mammoth. It also comes with a free copy of Valiant Hearts: The Great War, a 2D adventure puzzle game where you follow the story of various characters (along with a dog) from both sides of World War I.
The Far Cry Primal Apex Edition comes with the magical mystical mammoth missions, a copy of Valiant Hearts: The Great War, and five in-game bonus item packs. These bonus packs include a bloody club made of bone and teeth that cannot be broken by fire or combat (in other words, feel free to bash a large number of skulls in), various crafting recipes and crafting materials, and various animal companions (which are variations of the mammoths, saber-tooth tigers, and owls that you can normally obtain in the game, of course).
Including Valiant Hearts: The Great War as a pre-order bonus is an interesting incentive though, even if it was one of the free games that you could download several month ago. On release, Valiant Hearts received fairly positive review scores with most reviewers praising the art style and story, though the gameplay wasn't considered to be anything revolutionary.