Shukaku was in the last scans, so I think Gaara's pretty much confirmed at this point, too.
As for your predictions, they're all pretty solid. Would be nice to have more characters from Part 2 (Along with people like Hanabi and Toneri), but given how huge the roster is and the fact that this isn't just another Storm game where they could reuse models/movesets, it's understandable that there might not be a lot of characters who weren't in Storm 4.
... Although I still need Kushina. Rin would be nice, too.
Forgot about Shukaku, honestly. Might as well count the rest of the Jinchuriki in there while we're at it.
Hanabi will probably definetly be in, though I only say that because of her involvement in more recent things like The Last and the Boruto anime. She's gotten a lot of attention lately for someone who barely had any sceentime or even lines in the original manga.
Kushina is also a good choice for obvious reasons though I think it'd be fun to get away from the whole "super powered housewife" schtick she had in Storm and focus more on having her use some Nine Tails or even Uzumaki sealing style attacks. She can still be comedic, but still, nothing wrong with a little change-up.
I'm not sure about Rin. I mean, maybe if a Boyhood arc Kakashi and Obito are included but I just don't really see that happening either.
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