The official website of the TV anime series Nanatsu no Taizai has announced further details for the upcoming broadcast of its second season Imashime no Fukkatsu, and the special broadcast for the first OVA Nanatsu no Taizai: Ban no Bangai-hen.
A prequel episode recapping the prequels with additional scenes titled Joshou will broadcast on January 6, 2018, followed by the sequel's pilot episode on January 13. A "complete version" of the OVA depicting the story of Ban and Elaine will also be broadcast on MBS and TBS on December 23 at 6:30 a.m. and on Tokyo MX on December 24 at 10:30 a.m. The OVA was originally bundled with the manga's 15th limited edition volume in June 2015.
https://myanimelist.net/news/53316332ack