Developer Infinity Ward has announced that you have up until March 31 to trade in your PS3 or Xbox 360 Call of Duty: Ghosts for a PS4 or Xbox One versions for $9.99. After that, you will have to pay full price.
Players will also get to keep their stats and achievements when upgrading.
This follows the announcement from Infinity Ward that PSN and PC players of Call of Duty: Ghosts will get new customization options tomorrow, March 25.
You can go directly to the Call of Duty website for the full FAQ section. Have you upgraded your game yet?
Source: Call of Duty