Great ideas so far, and Cami, I think Mattel does have some Harry Potter license rights, they've made Harry Potter Barbie-sized dolls before. I too, would LOVE a Hogwarts outfit as part of the Halloween collection.

Other things I would like to see are:
A realistic looking digital camera for the AGT line
A laptop for the AGT girls
More camping and hiking gear (wouldn't a camelback be so cute!)
A red haired, hazel eyed, freckled AGT (Curly hair would be my favorite!)

That's all I can think of now, but keep the good ideas coming.