You cancel your order for/return the 360 version and buy the One version.
Alternatively, some places will apparently offer a £10 exchange upgrade for 360 to One versions. Bare in mind that things like unlocks will not transfer over, but if you purchase the premium subscription that will transfer onto the One.
Above references to 360/One can be interechanged with PS3/PS4.
Edit: content unlocked on the 360 version will apparently transfer over to the One.
if you preorder battlefield 4 for xbox 360 with Game you will have all of you £40 back if you want the xbox one version but you have to preorder battlefield for both xbox 360 and for xbox one they are both a £5 deposit with game and any dlc like the china rising dlc and your battlefield 4 rank you can take them all over to xbox one :)
Are Amazon offering the upgrage refund (same sort of deal as GAME) for changing from current-gen to next-gen!! And how does it work. I have ordered an xbox one and BF4 from Amazon, but think I would like to have BF4 for the xbox360 while waiting for them to release.
Amazon are not offering the upgrade refund the only way your going to get the upgrade is if you preorder the 360 version and the xbox one version in game that's the only way you will get all your money back but remember you need to preorder both the xbox 360 and xbox one versions there both £5 each to preorder go to game that's what im doing mate :)
It isn't that I particularly want to start playing BF4 early on my 360, I just don't want to miss out on the China Rising freebie, but because I have ordered Forza 5 Steelbook edition (which you can't get via digital download), I'm loathe to put myself in the position of having to swap discs on my Xbox ONE.
Oh well, I guess I will just pony up the extra money and get Battlefield Premium as well, hopefully including China Rising.