Board Thread:Spoilers!/@comment-25624943-20150228093719/@comment-24674051-20150228155425

Don't bet on Zelena and Cora interacting. Both appearances are flashbacks. Cora is probably in Ep 20, which has been confirmed as a Regina flashback. I think Zelena is in EP 17, which is a Robin-Centric episode.

Still, getting Barbara Hershey back for yet another appearance is awesome.