Board Thread:Spoilers!/@comment-26580042-20160727041703/@comment-24674051-20160727170539

Not sure about new worlds being explored (via flashback, since we've been told that the present day action is staying in Storybrooke), but we will likely see new kingdoms mentioned, and possibly explored.

So far for season 6 we have the LoUS itself, which I would classify as a different world/realm. we'll have FTL, which includes the EF and it's subkingdoms, and Agrabah. (It also includes DunBroch, Camelot, Arendelle, and wherever Mulan's home is). We'll probably get something on J&H (most likely LWC or Victorean England). And if they bring in Ana and other Wonderland chars, we could also get Wonderland, and possibly another tie to Victorean England.

What else is in store? that will be impossible to speculate without additional information on the direction and stories the writers are planning to share. I would hope that they have actually cast most of the new characters already, so that they can be in the background early, then brought forward as needed, similar to Season 1 where we had Archie, Red, the Dwarves, Dr Whale, Graham, and some of the others already in place from the begining, even if we didn't know their stories immediately.