What do you think is the "surprise" in the world of ROM is?

"something we have never seen before in a Sims game," that's a big promise. Magic Town in The Sims was the best--loved the Harry Potter world vibe and wouldn't mind a version of that. I've played all four PC versions, so I am really trying to give a strong guess for how magic and supernatural will be incorporated this time around...but I'm stumped! I do like what aurora333 suggested: a mirror-image of the normal world but it's magic.