User blog comment:B214/Season 3 confirmed!!!!!!/@comment-25537445-20141220182258/@comment-23847729-20141220213036

Look closely at the dragon from the preview. the horns are going forward, not back.

I think the dragon in the preview is Tannin because in vol. 5, Ise was most of the time running away from the fire breath of Tannin as he was trainning.