In a surprise announcement today, Sega and Atlus announced that Persona 3: Dancing in Moonlight and Persona 5: Dancing in Starlight would be releasing in the west in "early 2019".
You can read the full announcement over on the PlayStation Blog, which reveals that Persona 3: Dancing in Moonlight and Persona 5: Dancing in Starlight will release on the PS4 and the PS Vita.
Both dancing games feature Shoji Meguro tracks from the original games, as well as new mixes from ATOLS, Lotus Juice, ☆Taku Takahashi (m-flo / block.fm), Jazztronik, and more.
The rhythm titles for Persona 3 and Persona 5 might not have the new original story mode that Persona 4: Dancing All Night featured, but both will have "social scenes" where you can interact with characters from the original games. Speaking of the characters themselves, it certainly sounds like the original voice cast from both games will be returning for their roles, although we're yet to hear anything from Sega, Atlus, or any of the actors themselves confirming this.
Although we don't have concrete release dates for either Persona 3: Dancing in Starlight or Persona 5: Dancing in Moonlight, we do know that both titles will be launching in early 2019.