Activision has detailed the many ways users can upgrade their current-gen versions of Call of Duty: Ghosts to PlayStation 4 and Xbox One versions.
The list of options includes a Game Ahead program on Xbox One, which allows players to buy a dual-license disc-less version of Call of Duty: Ghosts. This license binds both the Xbox 360 and Xbox One version of the game to one Gamertag for $69.99.
There are also several retail upgrade options available from GameStop, Amazon, Best Buy, GAME, the Microsoft Store, and others. You can check out the extensive list of options here.
All upgrades from Xbox 360 to Xbox One and from PlayStation 3 to PlayStation 4 will carry over statistics and unlocks. Season Passes on both consoles will also be upgraded.