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A new blog post from the Call of Duty site says that a 30-day free trial of the Call of Duty: Black Ops 3 DLC will be released on May 30.

Yes, a free trial for DLC. DLC for a game that came out a year and a half ago. This might be the first time that only the DLC for a game was given out as a free trial before.
Next week, starting on Tuesday, May 30 at 10am/PDT, we’re kicking off the Call of Duty: Black Ops 3 Multiplayer DLC Trial Pack for PC, a 30-day free trial that will give players access to all of the multiplayer goodness found in all four Downloadable Content packs. Furthermore, all of the MP maps will be added to all of the playlists.

Already own the DLC?

Glad you asked. . .

If you already own the DLC that you’re playing, you’ll get a 2XP reward. The deal is even sweeter for Season Pass owners, who will receive 2XP on all multiplayer maps. And those offers last through the duration of the 30-day trial.

If, for some reason, you don't want to bother downloading this multiplayer DLC, you can opt-out using the instructions provided here.