User blog comment:Aguilla/AC: Revelations - What about Lucy../@comment-89.241.164.95-20110610233434

The at the end Juno tells desmond to find "the sixth" nothing has been referred to in any other context than senses so no help there...however it is unlikely they would kill of their main female character who has been supporting player for three games would provoke too much kickback, more likely they used that scene as the other posts have said shock-factor and marketing for the next game.