yeah i cant wait until it comes to america too, but i don't know when, they just came out with the first one
not to mention they even changed some stuff in the NA version. i was extremely disappointed when they made CS1 Sasuke and Kyuubi Naruto into characters instead of transformations like in the JP version.
i've been playing NH3 for a while now, and it's pretty dam good. btw, i forgot to mention that they didn't just add new characters to the game, they also added:
-New Arenas(the waterfall from sasuke v naruto, the meadow from gaara v kimimaro, etc.)
-New Transformations(drunken lee, butterfly chouji, etc.)
-New types of secret techniques, instead of just generic cutscenes(i.e. during one of Orochimaru's secret techniques, you take control of a giant snake, and your opponent has to do their best to defend themself against you until the technique is over)
-Minigames(my current fav is a tree climbing minigame in which you run straight up a tree dodging branches along the way)