Please note that although the release date of Gears Tactics on Xbox One is not yet known, Microsoft has enabled preloading of the game to the Microsoft Store for Game Pass owners. This is only the 103 Mb"placeholder"version for now, so you won't download the full game, but once installed it will be automatically updated when the final game is available.

To start downloading the placeholder, all you have to do is search for the game in the console Store, or from this page click on the three dots next to "Install/Play", select "Install on my devices" and then select the console on which to start the installation.