I think that frankenpony is just Glimmer Wing Sweetsongs head on Cupcakes body ![Smile :)](https://mlparena.com/Smileys/default/smile_001.gif)
I havent seen or heard anything to say we will get her but I ll keep everything crossed as I love Sweetsong.
yes,it is cupcakes' body, but I noticed that my two cupcakes don't have blond hair in their tails, so maybe those are from the time when cupcakes had bangs, perhaps?
anyway, I love sweetsong's cutiemark and her hair color, I think is just lovely :J