The official Twitter account for the Knights of Sidonia anime franchise announced tonight that the sequel film, Knights of Sidonia: Ai Tsumugu Hoshi, will be postponed from its May 14 premiere to June 4 due to the State of Emergency measures in Japan to combat COVID-19, which sees a majority of theaters in the countries most populous regions close.
Ai Tsumugu Hoshi will adapt the closing arc of the manga.
He also runs a YouTube channel about Japan stuff called TheDoctorDazza, tweets at @DoctorDazza, and posts photos of his travels on Instagram.