Probably less of a rumour now, but there still are no official listings or proper product pages at a retailer yet (this is only a product listing that is alleged to be from Target in America).

Studio Series TF2 (Deluxe?) Soundwave (which would be the satellite version), TF6 Deluxe Cliffjumper (hopefully a new Cybertronian mould and not just a redeco of one of the Bumblebees), TF6 Voyager Blitzwing, TF3 Deluxe Topspin.

I would expect that the New York Toyfair this weekend will reveal a few of these upcoming Studio Series toys.