Wow, awesome find.I'm not sure if anyone has recognised this but Pit's side B (Whirling Blade) reflects projectiles in this case, Samus' Charged shot.
Take a look at about 1:09 http://www.youtube.com/watch?v=vFlk7QvDPmo
Looks like it has much more potential :D
But then, like Raikage said..what good is his down-b?
And I agree with gimpy; Pit's Up-B is just too awesome, and really what will set him apart. Free-flight is just too cool.