Board Thread:Spoilers!/@comment-1916997-20150313202428/@comment-25375217-20150324152538

or maybe they'll go to china and recruit The Dragon to free him

Not really, but they could go to another land to recruit someone. It's confirmed we'll see some new and old realms; as of right now that's limited to LWM, FTL, underwater, Oz, and Arendelle. Not counting the mention-only Glowerhaven.