Well, Naruto and Sasuke are doubled on that screen, I guess they wanted to separate Kyuubi Naruto from Sage Naruto. Ditto for Sasuke, probably Cursed Sasuke and... and I have no idea what other form of Sasuke. It's too early for Susano'o, that doesn't happen until after the Kage Summit.
They have Asuma, but they don't have Kurenai (I guess because she's retired and pregnant by that point)
I think that the game cuts off at the end of the battle in Konoha (Naruto vs Pain) so therefore anyone who appears after that point would likely be saved for the next game - or perhaps even DLC.
Which means potential future faces are:
A (Raikage)
C
Darui
Omoi
Karui
Samui
Mei
Ao
Chojuro
Onoki
Akatsuchi
Kurotsuchi
Mifune
Kushina (I WANT TO PLAY AS THE BLOODY HABANERO!)
Fu
Torune
Danzo
Kyuubi?!!! eh? eh?
Naruto (Sealed Hatred)
Sasuke Susano'o
Kabutomaru
Or better yet, I'm hoping that if the company waits long enough (let's say about 3 years or more), we'd get more arcs than just the Five Kage Summit Arc and the Confining the Jinchuriki arc in the story mode of Ultimate Ninja Storm 3 if the anime gets that far into the manga. For those of you who think that the manga will end soon, Kishimoto stated in his writers note in volume 48 that the story will keep going for a long, long time. I'm just getting that out there as a response to anyone that may think differently about whether the Naruto series will end sooner or later.
About those characters, Kushina would be awesome to play as in a video game so yeah, that would be cool. Also by Naruto "Sealed Hatred" , Do you mean Dark Naruto or his Ninja Jesus Mode. Not too sure about the Nine-Tails though, maybe as a boss........... Oh now I just realized where your getting. Naruto transforming into the full formed Nine-Tails itself. That could work if Naruto actually does this in the manga and if the company does a transformation system similar to the ones in the DBZ games were you get more then one transformation (example being Killer Bee---Version 1---Version 2---Full Eight-Tails Transformation or if canon allows it to be called this, Version 3). Everyone else would be awesome to play as as well.