I think this is likely to be a prototype, color testing for the wings or hair or both. The giant styling size Twilight seen at the NY Toy Fair had the same pink/purple/yellow hair but also the white shine in her eye was a little star shape, just like Fantastic Flutters Twilight. This Twilight has the old eyes with a normal circle shine, I think (or I hope..) that she will have more details upon release. The Rainbow Power brushables were disappointingly plain but all the other ponies released in the line have had some kind of body symbols or painting, it would be a real let down to get a half-assed PTS seeing as she is fashion style and the RP FS Rarity at least had some little diamonds up her leg and on her face.