This is exactly what you probably think it is. :'D
I figured since Apedemak's Celestial base turns into Divine maybe Menhit's Skyward might become Heavenly? I just thought her base was pretty so I tried my hand at a base mockup for it. (the eyes are just for dramatic effect)
Edit: Yeet. Just realized there were mockups for Divine, Heavenly, and Astral in a news post like two years ago but I'll leave this here anyway in case Xy has any interest in it.
Lineless for Xy

Heavenly .vs. Skyward


Heavenly Mane: