It definently has to be a little sister. The doll she is holding looks a lot similar like a Big Daddy. She is probably one of the little sisters who did not want to be saved and misses Rapture. She might end up being a bad guy in the game and probably wants to create her own city due to the games title, Sea of Dreams, she might also be a little crazy due to her head jerking back and forth a couple of times.
It definently has to be a little sister. The doll she is holding looks a lot similar like a Big Daddy. She is probably one of the little sisters who did not want to be saved and misses Rapture. She might end up being a bad guy in the game and probably wants to create her own city due to the games title, Sea of Dreams, she might also be a little crazy due to her head jerking back and forth a couple of times.
BioShock 2: Sea of Dreams (Xbox 360): What secrets does the BioShock 2 trailer hold?