I agree that I originally thought she was taking a dig at Rumple’s appearance in the Enchanted Forest, but reading these theories about the Wizard of Oz makes me feel SO pumped for the idea of the Wicked Witch of the West. Seriously, it would be so awesome. I can really see Regina and the Wicked Witch having some awesome cat fights and and some even crazier tangled webs of power struggles. I would have to say that if this IS a reference to the fact that the Wicked Witch might be coming, that I don’t think Regina WOULD be the Wicked Witch. I think they’d have to be distinct.
One, my gut instinct just says that it would feel too weird and kind of unexpected and out of place for the show… I can’t imagine watching Regina turn green. xD Two, Cora misused magic all the time, and she never changed appearance. Regina seems to be much like her, with her type of magic, so unless the magic on earth is really screwy, I don’t think it would change her appearance. Rumplestiltskin’s magic seems to be distinct, more a part of him because he IS the Dark One, so I think his change in appearance is more related to the type of magic and the manner of acquiring it. I could be wrong, though. Anybody agree/disagree?