Currently in pre-production with the snappy title 'Jumanji 3', this sequel will have to get its skates on if it's going to make its projected release date of December 13th, 2019. Filming isn't even scheduled to begin until January!
Very little is publicly known about this movie other than the fact that the original cast have all been signed on for it, including Dwayne Johnson (does that man ever stop working?) and Karen Gillan. Gillan had previously spoken of an alternate end to the second film, 'Welcome to the Jungle', which would have left the door open to a sequel, but as that ending wasn't used we can't be sure where the plot will come from. We're sure they'll have thought of something that works. It's a fantasy film; there aren't really any rules! Except, of course, the rules of 'Jumanji'.