Get ready for a whole lot of Bon Iver. We think. Justin Vernon’s band today unveiled a mysterious new video titled “Sincerity is Forever in Season,” teasing some sort of project that will be “coming soon.” This clip — created, produced, and directed by Aaron Anderson and Eric Timothy Carlson, and branded by Jagjaguwar Records — follows two new tracks released by Bon Iver last month (“Hey, Ma” and “U (Man Like)”). Bon Iver’s fall North American tour plays Boston’s TD Garden on October 15. Bon Iver’s last album, 22, A Million, came out back in 2016, and Vernon’s Big Red Machine project played Boston Calling back in May. Stay tuned.