Tange did do a nice job, but she sounded a bit too girly for my taste. Houko does a better job with Kasumi's dialogue then cries though, and I prefer Tange there. Story mode would be awesome and pretty much required considering all of the new characters (then again look back to Sarah's and...
Considering that was what happened with the "exclusive" swimwear after around two months, It would be safe to assume that they'd come out as paid dlc later on.