Frogger on 15 February 2015
I don't think that we'll see another Zelda 3DS game, as the 3DS is basically done, but I agree; I'd like to see a sequel to MM. Since MM had only young Link, I think it would only be appropriate to end the now trilogy with adult Link set 7 years later.
Just make it as weird and different as MM. Stay away from Hyrule and Termina and do something new.
EDIT: I actually made a huge thread about it last year lol.
