Sequel might be planned for late 2019, to go up against Star Wars Episode 9
Sony's CEO pleased as hell at the sensational box office (over $772 million worldwide and still going) and mentions a sequel is very likely.
http://www.slashfilm.com/jumanji-sequel-release-date/
Only problem now is - the Rock is booked and very busy cooking. He may not have time to squeeze in filming for Jumanji Reloaded even if he wanted to. If you ask me, he should drop San Andreas 2 (if he's not locked into a contract). The first film was awful, and there is no way a sequel would do anywhere near as good as a Jumanji sequel.
Obviously, there are a lot of moving parts here. For one thing, Jumanji: Welcome to the Jungle star Dwayne “The Rock” Johnson is extremely busy and in high-demand. He has a wealth of upcoming features that have yet to begin filming, including San Andreas 2 and Black Adam. And then there’s that Fast and the Furious spin-off co-starring Jason Statham, and due out July 26, 2019, not to mention the next Fast and the Furious film, slated to open in 2020. In other words, is the Rock even going to have time to fit Jumanji into his very busy schedule? And then, of course, there’s his rumored (and likely not-happening) presidential run to consider…share