I saw these yesterday at a Toys R Us. Unlike the Disney Store dolls, I don't think these are articulated. (edit: I think Elsa and Anna's "sleeves" are actually molded to their arms, and the skirts don't appear to be removable.) Both girls also come with crowns, which I'm thinking may be a spoiler?
They also seem to have the "molded top" thing going on, which I personally really dislike. I think it looks terribly cheap.
Another set had Anna with lights and music, and Elsa with a color change with temperature dress gimmick.
There was also a two in one castle.
Anna's side. (Whoa, holy mother of blurry photos, Batman!)
Elsa's side. I'm digging that plastic throne!
There was also a very cute mini figure set.
I also spied the Equestrian girls set which includes Luna.
She's cute, but not "buy a whole set of molded-top/elastic skirt characters you probably already have" cute. Not to me, at least. Not without some good articulation and some extras.