Well he had this very short cameo in Rarity's song "Becoming Popular" and it would be nice to see some character development for him. I doubt he will ever get much focus in the show but just a short scene that shows that he did learn something from the gala disaster would be nice.
Yeah, it was nice to see BB there and being non-jerkish in his behavior.
And I agree with everything on Diamond Tiara. I don't even like her (don't hate her, mind, I'm just not really a fan) but the poor filly deserves some character development.
Though she kind of got some when her father gave that little lecture in school and she was shown clapping; much as Silver Spoon did in that same episode when she clapped for Granny Smith.