Lord & Miller (of Jump Street, Lego Movie, others) have left, during filming no less, the Han Solo film http://variety.com/2017/film/news/star-wars-han-solo-movie-directors-phil-lord-christopher-miller-exit-1202473743/
It's cited as "creative differences" which is pretty much a euphemism and really a new euphemism should be cooked up cos no one believes it's ever "creative differences" anymore. Especially if you're nearing the end of a shoot, usually and differences the directors have and the producers have should have cropped up during pre-production.
Lord & Miller being on Han Solo film was one of the things in the "pro" column, and them leaving is a bit of a blow. Rogue One having reshoots too doesn't exactly help smooth fears it's gonna be a bit poopy.