User blog comment:B214/Season 3 confirmed!!!!!!/@comment-74.110.108.150-20141206135457

I don't think season 3 is gonna be a filler 'cause I saw the trailer and I saw Issei attacked by a dragon, like Tannin's training in volume 5, and the sparring with Sairaorg was probably jumped ahead of the light novels to the anime, it wouldn't be the first time it happened.