There were pictures of a female model in Superbot's office. It could be a background character or playable character, you decide which one you want to believe.
Specifically, it appears to be Yorda from ICO. (She's your companion character throughout the game.) If Yorda is in, Ico (the player-character) will be with her. So Ico might be playable, either alone or with Yorda, or they might just be appearing in a stage somewhere. --- RocketJess, blasting off again! PSN: iscah_rambles