CDD:IW & COD4:R will be 2 separate downloads

[krayam]

For the disc-based (physical) Legacy Edition of Infinite Warfare on Steam, installation discs will be provided along with a Steam Key that will allow you to install both Infinite Warfare and Modern Warfare Remastered. An internet connection is required to download content. Once content has been installed, you no longer need the installer discs to play content.

[RIP]

Oh so you know where to get the disc's? Where?
And do you know if the campaign modes will be coop like the Last COD Blackops3?