SPOILERS AHEAD. This afternoon, Hasbro uploaded the second sneak peak to their YouTube channel. The main concept of this clip is conveying that people still don't accept the new Sunset Shimmer because Twilight and the others made her nice. There's a lot of aggression towards Sunset in this clip where Sunset is trying to be a nice person.
Personally, I really like this clip because it does show character development on Sunset. In my honest opinion, Sunset was a pretty bland character in the beginning of EQG 1. Hopefully Hasbro can persuade me to think otherwise when Rainbow Rocks is released to the public.
Just your average person who posts about anything pony related and sometimes things about magical blue boxes.