If you played Gears of War: Ultimate Edition, they are sending out tokens to download all of the previous GoW titles to play via backwards comparability on your Xbone. If you're like me, you've gotten those titles through Games with Gold, or already played and finished them when the originals were released.
If you are not going to be using your code, and are not interested in trying to sell/trade it off, I am working on the logistics for a fun little competition here like we used to do at 360v on the regular. My 4 codes are going into the prize pool, and if anyone else wants to donate theirs, just let me know via PM. I offer nothing in exchange for them, except a thank you and recognition of the donation when the contest launches (probably Jan/Feb time).