Gameplay features and story are only speculation at this point, but the teaser hints at an underworld present in the infancy of the series and (maybe?) more than one playable protagonist. Ganon returning, in any form, is a given and the last shot seemed to imply castle hyrule rising akin to the sheikah-towers and temples. I don't count on any new info until next year, but this teaser has me excited. Please share any info or speculation you have or find.