Finally watched the opening eps and I must say, they were great!
New opening sequence was pretty neat, liked the expansion of characters. Even Discord being in Fluttershy's house. Speaking of him, I actually liked Discord in this episode, really confused whether he's gone good or not, matching his whole chaos sthick quite nicely. Also, seeing the past of NM happening and the Discord battle was pretty awesome too. Writers did well here with the backstories.
My only gripe was the ending was kinda abrupt. I expected, I dunno, more Celestia and the gang talking, not S3 Twilight flying ending. Oh well, count me excited for more of S4