Free Call of Duty: Infinite Warfare from December 15th to 20th, two campaign levels and multiplayer up to level 15
Call of Duty: Infinite Warfare will be free to play in a limited capacity fom the 15th to 20th of December. The firs two single player levels of the campaign will be up for a trial run, and those interested in the multiplayer will be able to fight their way up to level 15.
Activision would like you to download the full game anyway, 60GB worth of incentive right there. It will be sitting on your HDD until you decide to unlock the rest with money. Aside from that, the multiplayer is bared behind the premium subscriptions on consoles (PS Plus and xBox Gold).
So, depending on your Internet connection, it might take you longer to download the trial than to play trough its single player component. But go ahead, it's free and promises to be a nice try.