Evidently showing that Rapture"s mad scientists don"t discriminate on the basis of gender, unnamed sources have told Kotaku that BioShock 2 will feature the appearance of "Big Sisters" -- a female version of the hulking Big Daddy that protected each Little Sister in the original game.

According to the information from these sources, the Big Sister will be an "Amazonian version" of the Big Daddy, donning "sleek" and "svelter" gear. Backing up this rumor is a small tidbit that appeared on the recently launched BioShock 2 teaser site. The site featured a fictional news story of a kidnapped girl, and the description of the attacker seemed to echo that of a Big Daddy -- except for a few key distinctions. The story says the attacker had "incredible speed," and that this person was "thin, above average height, and wore some kind of "red light."" Incredibly fast, thin, and above average height... does that sound like an average Big Daddy to you?

With the Game Developers Conference coming up on March 23, hopefully more on BioShock 2 -- and these rumored Big Sisters -- will finally be revealed.