Ulver just released their new album Flowers of Evil in August 2020, and are already back in the studio. The band used the hashtag #Lupercal for the post, which I'm guessing has something to do with Lupercalia. According to a Google search I had to do to figure this one out, Lupercalia is "an ancient Roman festival of purification and fertility, held annually on February 15."
So yeah, maybe new Ulver on February 15? It certainly fits the band's recent historical themes of their last two albums.