A bit blurry, but that is apparently Zack/Zax. Whether or not he has an active role or more likely just a flashback scene in the movie is still yet to be known.
We've been through this but it's not the same. Other game related movie have nothing to do with the actual game other than the name. This actually does have to do with the game, it completely connected to the end of FF7. So it makes sense to be in this forum.