none at all =) but it's just better this way cuz we keep talking about it and getting off topic lol ^^ so yeah. lol i still think we'll all be disappointed and have to deal with the dlc being different character costumes =O lol jk but i dunno
so if kisame is in OBVIOUSLY itachi will be there.* and since butterfly choji is in there then obviously we'll fight the sound 4/5 so then if they actually only have 25 (they might jsut go ahead and put more charas for us without having to use dlc so quickly =D ) so we can easily count them as dlc or additional chara's then the 25. other than that i really wish they would give us some info..
one of the other things i was wondering if maybe, how many diff story modes are there, like say, i know there will be naruto's. but will be able to play through other people's story modes? like sasuke's mode where you do all the battles he did and such or other ppl? i dunno, but if not then maybe those will be dlc also.
Butterfly Choji hasn't been confirmed. It's speculation that he'll have that transformation. I have no serious doubts that he'll be in there, but the wikipedia still isn't the best source of information.