Disney Parks & Resorts has announced a third Character Meet & Greet for the Star Wars Launch Bay at Disney's Hollywood Studios:

Quote Originally Posted by Disney Parks & Resorts

... BB-8 will appear in addition to Kylo Ren and Chewbacca, two characters from the Star Wars galaxy who guests regularly encounter at Star Wars Launch Bay. In addition to character greetings, the location also offers guests the chance to explore galleries full of treasured memorabilia and authentic replicas of large-scale Star Wars artifacts, including some from the latest film in the franchise, Rogue One: A Star Wars Story.

... He’ll make his debut appearance during the Star Wars: Galactic Nights special event[April 14, 2017], and will continue to greet guests from then on.