Avalanche’s Just Cause series will go on for a while yet, yes it will. That is, if a new domain picked up by publisher Square Enix has anything to do with it.
Just Cause 4‘s future web presence has now been secured though a number of registrations, including justcause4.com and justcause4.fr, as spotted by Fusible.
Of course, Avalanche is yet to confirm even Just Cause 3. They have been dancing around it somewhat though, hinting it may be an early next-gen game. More on that here.