What I really want to know is if this is going to be a standalone "Anthology" film akin to Rogue One or if he's directing the start of the new trilogy (the one that was almost headed up by the infamous duo behind the more hated seasons of Game of Thrones until they left Star Wars to do something else, much to the joy of Star Wars and GoT fans).
I think it's likely a standalone, and when Disney finds someone to head a new trilogy I honestly feel it'd be a good idea to just have that one person direct or at least produce the whole trilogy because one of the biggest problems with the last trilogy is originally it was suppsoed to be a different director for each movie, but when Colin Trevorrow had a big flop before getting to direct his movie and Last Jedi got mixed reception Disney panicked and just had JJ come back to finish things, but his stuff didn't meld well with what Rian Johnson did.
I Hate Everything probably said it best: had Rian Johnson done a standalone movie instead of doing the middle of the sequel trilogy he probably would have gotten more praise for his style of storytelling being used in Star Wars (Johnson's non-Star Wars films are all very well liked, and it probably helps said movies aren't the middle movie in a trilogy). Had the entire sequel trilogy been done by JJ it likely would have flowed better and the middle and final movies wouldn't have contradicted each other in some big ways.