Tennyo
Higher Further Faster
Since no one seems to have mentioned it, it's Hecatoncheir, which explains all the arms.
http://www.ffworld.com/?rub=news&page=voir&id=1615
Vanille's pose aside, has anyone else noticed that Cid seems to be holding Lightning's weapon in one of those screen shots?
Do we assume she get's captured at one point? Or does he just have a similar weapon ala Seifer vs Squall type stuff?