I explained my reasoning when I first posted my roster prediction, but here it is again:
I don't think Project Soul will want to add very many little girls to the roster, just because they tend to be unpopular outside of Japan. Tira, Cassandra, Talim and Xianghua can all be (broadly) described as little girls. If one of these characters ends up being cut, I suspect it will be Talim, just because Project Soul seems to adore Cassandra (treating her as the quasi-mascot of the series). And they seem to inexplicably hate Talim.
Of course, if I could choose the roster myself I would pick Talim over Cassandra, but my guess it that Talim will be snubbed again.
The other reason I think we might not get Talim is that, thus far, it seems like Project Soul isn't going to dramatically change any of the character profiles for this "reboot". In terms of storyline everything they've shown suggests a return to the original SC1 timeline, but with the potential to branch off in different directions. In other words, I think Talim is likely to still be 11 years old at the time of SC6. Of course, that doesn't mean she absolutely cannot appear in the game, but it does make it less likely in my mind.
Salia would be great. Giver her a proper long sword style!