On Pottermore she just revealed, at long last, the North American school of magic (located in Massachusetts upon Mt. Greylock) - complete with a Sorting Ceremony for four completely new Houses.
"It is sometimes said of the Ilvermorny houses that they represent the whole witch or wizard: the mind is represented by Horned Serpent; the body, Wampus; the heart, Pukwudgie and the soul, Thunderbird. Others say that Horned Serpent favours scholars, Wampus, warriors, Pukwudgie, healers and Thunderbird, adventurers"
(Rowling just said (and I quote) "there is no equivalence between Hogwarts and Ilvermorny Houses.")
For myself, I was sorted into the Horned Serpent. (My Hogwarts House is Ravenclaw)