I saw that thread, I remember if from a while ago too xD poor thread got rofl pwnt by downvotes.
I wonder if they were just teasing that episode? Next is Spike taking care of the pets. Then ep 11 is the discord one. Fluttershy is the only one who wants to reform him so if she's gonna get a dragon voice it's gonna be in the episode, turning her into a dragon or something sounds exactly like Discord.
That leaves episode 12 to be the God tier majestic episode of Rarity and the 13th to be a season closer with the mane 6 doing something silly (hopefully with more Luna <3)