Square Enix announced a Just Cause mobile game at The Game Awards.
The appropriately-named Just Cause: Mobile is a free-to-play action shooter set in the Just Cause universe due out on Android and iOS in 2021, Square Enix said. There's single-player, four-player co-op, and 30-person competitive multiplayer, "offering an on-the-go grappling, gliding, and shooting experience, all presented through exhilarating top-down gameplay."
Here's the trailer:
Just Cause 4 came out December 2018. No word yet on a Just Cause 5.