The free period has already started, and will run until Sunday at 1pm Pacific Time (that's around 6am AEST in Australia). If you want to keep playing, the game has a temporary 40% discount, or 25% off the Digital Deluxe version.
Black Ops 3 is a decent instalment in the longrunning series, according to our reviewer Ian Birnbaum. "There’s a lot to do and see in the multiplayer modes, even if I do find them exhausting and repetitive," he wrote. "Appreciating Blops 3 is like enjoying a great B-movie."
Meanwhile, if you're feeling a bit burnt out on the series following last week's Infinite Warfare reveal, Tyler has some words about why it should stick around.