It will Premier in January.
The official website of Little Witch Academia ahs iploaded a new Teaser where it proclaims that “A new Story begind here”
Anime News Network decribes the story as follows:
“The show’s story revolves around Akko, who as a child watched the witch Shiny Chariot perform a show, and from then on dreamed of becoming a witch. She enters the Luna Nova Academy, a school for witches that Shiny Chariot attended. In this new town she meets new friends and starts a new school life. At the school she has lessons on riding brooms and the wonder of magic, but Akko and her friends Lotte and Sucy keep getting wrapped up in tumultuous events.”
Via: Anime News Network