I think it does look like the storybrooke timeline hatter. I compared pictures and the coat in the promo does seem to be the one we saw him in earlier when he kidnapped Emma and MM. I’m guessing it’s a post Hat trick hatter. He could be in SB cause his house had a stone wall nearby, but the wall doesn’t seem to match the archway in the promo stylistically, so I’m guessing it’s FTL or a third place.
I took a screen shot of the hand grabbing the apple, but I’m not sure if theres a way to post it. I can’t be sure, but I am leaning towards a girls hand, and the sleeve is dressy but simple, like one of Regina’s suits or the hatters coat. It looks like a suit sleeve. I think it’s Regina grabbing the falling apple.