play battlefield 4 on xbox 360 and xbox one
Yes, when you go to Battlelog, you will have two separate soldiers with different progression bars. You can track the stats the same either way. If you want, you can simply go to "Change Soldier" on Battlelog, and swap between your Xbox 360 and Xbox One soldier for being "Active". You dont have to do this to play though, it just displays that soldier first on your list and gives you the option to change stuff thru Battlelog while playing.
As for the disc, you will have to buy a separate one for Xbox One. The $10 upgrade was only active for a short time after the Xbox One version release. If you want to be able to play on both, you need a copy for both systems. You can buy a digital copy for Xbox One too if you prefer, but personally I am a physical copy kind of guy on console. But that is all personal preference. Remember, on Xbox One, you need to install the game to the hard drive, even if it is a physical disc.
