I think only we, the audience, will see the WWW at first. I think the storybrooke residents will see a lovely beautiful sweet woman who everyone adores and trusts, like a school teacher. We, however will see her morph, in green smoke, into her wonderfully wicked green awesomeness.
I’m wondering if she might attack them in FTL. There’s that shot in the promo of Snow and Regina on the ground looking up at something. Doesn’t mean they’d all instantly recognise her in SB without the green and the broomstick though.
I hope you’re right, and I hope she draws blood by pricking her thumb.
From Macbeth. “By the pricking of her thumbs. Something wicked this way comes.