A post over on OXM has detailed an upcoming promotion available from UK retailer, GAME.
Involving FIFA14, Call Of Duty: Ghosts and Battlefield 4, GAME will be giving you £40 worth of credit if you trade in any of the above Xbox 360 games and replace them with the same on Xbox One.
The offer will run only until Christmas Eve, but for anyone wanting to jump on said games early, and then get themselves over into the next gen party shortly after, these upgrades are looking like a pretty decent deal.
Source: OXM