Marvelous and Type-Moon launched a teaser site for a new Fate/Extella title that is in the works. Information on the new title will be revealed on August 30, 2017.
Back in April we learned that Type-Moon is working on a new Fate/Extella game that will focus on more Servant action, and it seemed like they were working on a lot of different ideas for the new game.
Fate/Extella first released in Japan in November 2016 for PS4 and PS Vita. The game arrived Westward in January 2017, followed by worldwide Nintendo Switch and PC releases in July 2017.