Fans are worried Kevin Costner won't be returning to "Yellowstone." The actor recently shared a photo on Instagram saying he's focused on the production of his new film "Horizon" but looks forward to getting his band back together for more music related to the hit series. The comments on the post were positive but many were disappointed that Costner didn't acknowledge the western show. The actor had issues with the filming schedule and there still isn't a confirmation to when the final episodes will be shot.