During the Call of Duty XP fan event, Activision announced that Infinite Warfare will get a multiplayer beta test in October.
There is a caveat, however. Access to the beta seems to be limited to people who pre-order the game on PlayStation 4 and Xbox One. The beta will not extend to PC.
PlayStation 4 owners will be the first to play the beta on October 14th. Xbox One owners do not currently have a start date. If past history is any indication, they will not have to wait too long.
Call of Duty: Infinite Warfare will release on PlayStation4, Xbox One, and PC on November 4th.