Board Thread:Spoilers!/@comment-4877635-20170706172850/@comment-25926288-20170722100728

Wicked Wizard of the West wrote: Mark Isham posted a pic with a door, possibly in the Hatter's Hat. I'm leaning towards the idea of Rose playing a female Mad Hatter now.

http://efnewsservice.tumblr.com/post/163265023192/markisham-the-door-to-season-7-ouat-live-at Well, the door itself is the Arendelle door inside the new hat. Could be doubling as a new world, but it was used for Arendelle (plus icicles) in the second hat.