All that's for sure right now is that Sephiroth will win and Davesprite will die. I think Dirk Strider will be showing up just before Davesprite goes - there could potentially be other backup there depending on who Xion and Davesprite contact before the fight begins. It might be Waver they get in touch with!

Also, I am referring you below. Is anyone announcing network-wide the outcome of the battle?