Atlas Gorge was a DLC that was only obtainable from the DLC pass or any of the collector’s editions of the game. This map is a remake of the map Pipeline from Call of Duty 4: Modern Warfare. However according to a Twitter Post By Slegehammer games it will be released for free to all players via the games in-game store. You could have started to download the game as of yesterday.
— Sledgehammer Games (@SHGames) May 23, 2016
This year Infinity Ward is developing Call of Duty: Infinite Warfare and this comes with a remastered copy of Modern Warfare but it only comes with premium versions of the game. The remastered version of Call of Duty 4 will not be sold on its own.
Infinite Warfare comes out on November 4 for all next-gen consoles. The movement in this game is said to be similar to Black Ops III but some maps and missions will take place in outer space and on different planets.