A new entry in the Fate/EXTELLA series is in development, Marvelous announced during the Fate/Grand Order Chaldea Radio Station Special Fate/EXTRA CCC Special Event Commemoration Broadcast.
Details, including platforms, were not announced, other than that the game will focus on Servant action and do various things. Please wait for a follow-up report for more information.
The first game, Fate/EXTELLA: The Umbral Star, is available now for PlayStation 4 and PS Vita, and will launch this July for Switch.
Thanks, Hachima Kikou.