Board Thread:Spoilers!/@comment-27060727-20160929050506/@comment-24674051-20161122182358

The flashback will likely be about Rumple trying to lure and capture the Black Fairy with Jack & Jill's child. And I'm sure something will go wrong with that, and it will possibly involve Blue. Since somewhere else it was posted that one of the minor reveals of this episode relates to Rumples despise of Fairies, so perhaps Blue and a small group of Fairies band together to foil Rumple and the Black Fairy, and this is where Blue banishes Black.

Present Day is more questionable, other than Emma and Killian are trying to help Belle. Something (likely Rumple?) causes rapid progression in Belle's pregnancy (hopefully it's not Granny's Onion Rings again), so we are going to see the birth of the Baby (and additional mess up with that to reach an end result of an Adult Rumbelle child). And it appears that Rumple is going to finally go off the deep end and lose control of his anger. One question would be whether the Black Fairy is involved with this as well. (Perhaps the "Old Nun" is the glamoured form of the Black fairy in present day?)