Yeah, missiles were weakened and so was her charged B. It charges faster from what I've heard though.
A new advanced technique has already been supposedly found. It's called the Ink Drop, named after a Brawl player who goes by the name of 'Ink.' How it's done is basically like a dash dance (where you hit left and right real fast over and over making the player move left and right in place) but instead of hitting the opposite direction right away, you just wait until you get to the point where your character would do a longer turn around animation and then hit back, causing your character to fall (drop) in place. The Yoshi in this vid does the Ink Drop (the first part of it, don't mind him getting back up).
http://www.zauron.net/images/SSBB/YoshiWeirdRoll.gifHowever, although your character falls, you can cancel the fall with anything, from a smash, to a jab, to a grab, or even a roll like the Yoshi in this gif does. Basically you can do it to get behind the enemy and then instantly attack out of it.
Don't know how useful and practical it is, but the guys at E for All say it has potential. We'll see though.