Females get all the male hair options and males get all the female. A new bald option, as well as 1 new preset for Sara and 1 for Scott, as well as 1 lighter skin tone and freckles. If you like that sort of thing.
Really cool to have access on the ship, I must say.
Apparently, Alec's appearence can be set to the default and not be based on the PC'S preset, but it's looking like that can only be done at the beginning of the game (which only makes sense).
