Square Enix announced a couple months ago that they were working on a new downloadable content pack for Kingdom Hearts III called Kingdom Hearts III Re:Mind and we now have new information about it and a release window.
Tonight at the Kingdom Hearts Orchestra: World of Tres concert in Los Angeles, Square Enix revealed a trailer for the new content revealing that players will be able to play as Roxas, Riku, and Aqua in it. There is much more than that but I won’t write it here for spoilers. The content is scheduled to release Winter 2019. Check that trailer out below.