Yes, this is old news, but I stumbled across it now, lulz.
Article
I think the other guys who cared even a little about these games left long ago, but oh well.
SE have registered Just Cause 4. But what about JC3? The article gives you the basic theories behind why this could be, so there's no shocker, but it's still funny that 4 is registered before 3. I'm definitely looking forward to a new game in the installment. I'd be perfectly happy if the game was just like JC2 but with a new story and map etc.