Scizor_99 on 23 February 2015
I have the impression that Nintendo usually standardizes the number of dungeons at approx. 7-10, so I think we could expect somewhere in that range.
I think that they're going to try to lengthen the game with more extensive sidequests, secrets hidden in the overworld, and real-time events, which is similar to what many open-world games usually do.
They did express interest at doing DLC, so if that becomes a thing, then they could add (I think) up to 2 extra dungeons, additional sidequests, story, etc.
