The November 26, 2020 release date actually leaked last week through Amazon Japan. However, the date on Amazon has since then been changed back to the placeholder date of December 31, 2020. The article from Dengeki basically confirmed the release date for Labyrinth of Galleria: Coven of Dusk. The deleted article was scheduled to publish on July 28, 2020 at 3:15 pm JST, so we can expect the official announcement to arrive sometime before then.
Nippon Ichi Software first announced Labyrinth of Galleria: Coven of Dusk in March 2019. The game features new characters and story written by Tatsuya Izumi, who wrote and directed Labyrinth of Refrain: Coven of Dusk and The Witch and the Hundred Knight. After a delay from July 2019 to Spring 2020, Nippon Ichi Software indefinitely delayed the game last November in order to increase the game volume. We still haven’t seen much from the game as far as trailers go, but we saw a teaser trailer in May 2019.