I never thought IGA had a big role in MoF, anyway. Even if he is a part of the game, maybe he's something minor, like consultant. If he was, there'd really be no reason for him to attend E3, since his role would be minor.
But, then again, we'll have to see what happens. Right now, MoF seems the more mysterious of the two games. LoS2, we know what to expect(more or less). MoF is still a wild card.