So a Duodecim page on Facebook shared this gameplay video. Enjoy!

Bartz vs Gilgamesh


Key attacks from Gilgamesh are Rocket Punch, Missile, and Hurricane. As for Bartz, his Slidehazard has changed (perhaps due to Cloud being a Chaos Warrior or the new character he's imitating, but meh) and he also uses Ifrit quite a lot.