Microsoft has announced that Call of Duty 3 is now available for you to play on the Xbox One console. This means your Xbox 360 purchase is playable on the newer console.
Larry “Major Nelson” Hyrb posted via Twitter: Call of Duty 3 is coming to Xbox One Backward Compatibility today
Some people are happy about this, although many more want the Modern Warfare games to be backwards compatible. Hopefully they will make the list very soon. Call of Duty 4 is being remastered anyway so most people will play that version going forward.