It’s definitely Cora that Snow and Emma encounter. I went frame by frame through the promo. You can tell by cloak. It’s the same black cloak Cora wears in “Stable Boy” and the hair is the same even though you only see her from the back. So my theory is that she’s ruling whatever is left of the Enchanted Forest.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.