IGN posted some impressions and vids. Playable characters include Naruto, Sasuke, Sakura, Kakashi, Iruka(-sensei), Haku, and Zabuza. i've seen pics of Rock Lee, but i'm not sure if he's playable or not. The B and A buttons are used for attacks, Y for throws, and X for releasing a special attack (when your bar is full). Pressing up or down with an attack button modifies it. The cel shading looked okay, capturing the basic look of the series, but some of the moves looked awkward and the animation was somewhat stiff and obviously hand motioned. It looks like you can perform a kawarimi as an escape move. Also, it seems like none of the characters actually say their jutsu or peform hand seals when performing them. Boo! Some of the voices (like Zabuza's) sound a bit off; definitely different from the anime. From what i can tell they use the same seiyuu.
i've preordered mine, hopefully i'll have it Tuesday. i'm a little disappointed that it doesn't encompass the total feel of the anime (there is a story mode though), but i can't wait to actually play it and see what all there is to it.