Your "Free Game" is a choice between Assassin's Creed: Unity, Rare Replay, Forza Horizon 2, amd Sunset Overdrive. Once you add the Xbox One bundle to cart at the MS Store scroll down and look for the "Choose your free game". Check the "Add to cart" box for the game of your choice and then scroll back up to hit "Review and Checkout".
Another $299 Xbox One is the LEGO Movie Videogame bundle and includes the same bonuses this Gears of War bundle enjoys.
Live at 11/25 9PM PST: Amazon has a bundle for $299.99 with Just Dance 2016 and Forza Horizon 2.
Note: The Microsoft Store Kinect Bundle with a bonus $60 Xbox Code and Free game is out of stock.
In addition to the 500GB Console + Kinect you also get 3 games: