You can earn rewards in Modern Warfare 3 upon release by watching others play the Call of Duty: Beta on Twitch.
The beta is currently live e and runs through October 16, and tuning into others on Twitch playing the beta will earn you rewards for Modern Warfare 3 Multiplayer, Warzone, and more to use upon release.
The more you watch, the more items you can earn in-game for Modern Warfare 3.
Modern Warfare 3 is out November 10 on PC, PS4, PS5, Xbox One, and Xbox Series X/S.