The official site has now revealed that it’s being delayed from whatever their internal target date was and a new date will be coming soon.
Announced in the spring 2017 period that it was in production, the Yuri!! On Ice: Ice Adolescence feature film was set for a 2019 debut.
It’s been largely quiet since we got some materials in late 2018 but we never had a formal date during 2019 to latch onto.
The series was directed by Sayo Yamamoto, who also handled the series composition with Tadashi Hiramatsu on as the character designer and was animated by MAPPA.