We can judge Soul Sacrifice until it appear in the comg chartz because the last game have 35 point it quite big Soul Sacrifice could be not so fard less then 35 points.
AKB had less then 19 in lauch but sold 33k first week.
That doesn't mean much though. AKB game was released during holiday. It's very hard to see Soul Sacrifice to have 35 points but open with 100K. right now it looks more and more likely it will open in 50K-60K range like ToIR.
MikeB predicts that the PS3 will sell about 140 million units by the end of 2016 and triple the amount of 360s in the long run.