Kinect reflected the change in the way of play videogames along Move and the Nintendo’s Wiimote. Microsoft wanted to take advantage of that temporary situation transferring IPs with classical mechanics to the Kinect ecosystem. The result was underwhelming and those productions did not satisfy hardcore gamers. Maybe, Kinect was not designed to shift traditional procedures into the gesture mechanics.
Xbox 360 and Gears of War have to appear always interwoven; the Epic Games saga helped the Microsoft system to colonize millions of living rooms. Therefore, the logical step imposed to transfer Gears of War to the Kinect environment. Potentially, this powerful IP could appeal hardcore gamers to the Kinect offer, at least, it was the idea.
Gears of War: Tactics was born as a RTS game with the vibe of Gears of War. Tactics contained the oppressed aura of Gears of War in its props, the Locust and the Hammer of Dawn. The gameplay seemed to be dynamic and frenzy.
Check the first, and maybe the last, Gears of War: Tactics gameplay:
Apparently, Epic Games developed Gears of War: Tactics until the alpha stage, after that, the game was presumably canned.