Board Thread:Spoilers!/@comment-25926288-20161021174343/@comment-24674051-20161129181012

Mackenzie Grace was spotted on set filming a scene, so I would say we will have an Emma flashback. So we'll likely have Emma in whatever world she's in (and other cast members as needed to fill out this Alternate Reality), along with Regina it would appear (based on promos for "Wish You Were Here"), the rest of the Gang in Storybrooke dealing with Queenie and possibly Genie Aladdin, and a flashback for Emma.

And I'm going to guess that Regina will encounter Robin in Emma's alternate timeline.