https://www.polygon.com/2017/10/25/16541790/metal-gear-survive-release-date-ps4-xbox-one-konami

Metal Gear Survive, the survival game spinoff of Metal Gear Solid 5: The Phantom Pain, will be released in North America on Feb. 20, 2018, Konami announced today. The game will come to Europe two days later.

Konami originally planned to release Metal Gear Survive in 2017, but delayed the title to 2018 to give the development team more time to polish the game.