Finally, an update regarding the lore of KHux. Only took a year to announce.
Personally, I'm under the assumption that this "new" character is the somebody of Larxene. Every somebody of Organization XIII has met Ventus thus far outside of Demyx, Luxord and Larxene. With regards to the Keyblade transformation for Starlight, it's more than likely going to be Second Form in my opinion. I really don't see an exclusive transformation for Starlight.
Personally, I'm under the assumption that this "new" character is the somebody of Larxene. Every somebody of Organization XIII has met Ventus thus far outside of Demyx, Luxord and Larxene. With regards to the Keyblade transformation for Starlight, it's more than likely going to be Second Form in my opinion. I really don't see an exclusive transformation for Starlight.