Anyone think the last playable character (I think it was speculated already) could be Gabriel himself? I can't think of any other reason why they'd keep the last person secret, unless they'll do it to generate more buzz before release or something. Maybe the game just jumps into the other characters' stories first, then Gabriel is revealed to explain loose ends/events between LoS and MoF, etc. during his part of the story.
Eh, Gabriel probably isn't a playable character at all, but I have a feeling that fans will be let down when the last one is revealed.