Here's When Gears of War Xbox One Backwards Compatibility Codes Start Going Out - GameSpot

If you bought the Ultimate Edition, you'll get codes for Gears of War 1-3 and Judgement starting soon.
Gears of War 3 is the conclusion to the Gears of War saga.

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A much more simplified image from Gamespot compared to the IGN

Gears of war Collection XBOX (GOW 1,2,3, Judgment)

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