Just saw some youtube battle vids of Vaan, Tifa, Laguna and Lightning 
From what I can make out, Vaan uses all of FF12's weapons (I saw a katana, gun, bow and hand-to-hand) as well as plenty of magic (saw a water spell, earth spell and some kind of fire based charge attack)
And Laguna does indeed have Desperado, the beginning has you controlling Laguna's shooting while he's in the air and following up with the Ragnarok Cannon which from what I hear is a japanese thing because of Laguna's and the Ragnarok's japanese names sounding similar which we wouldn't see on the English version obv.
Also apparently Laguna uses his machine gun, a rocket launcher, a shotgun and a sniper rifle as well as some kind of laser cannon which must be the Ragnarok thing.
Also, Vaan uses the Tournesol from FF12 in EX mode and perches on his sword for his victory pose, Laguna has his old FF8 victory pose
/ random crap in case anybody doesn't know it yet

From what I can make out, Vaan uses all of FF12's weapons (I saw a katana, gun, bow and hand-to-hand) as well as plenty of magic (saw a water spell, earth spell and some kind of fire based charge attack)
And Laguna does indeed have Desperado, the beginning has you controlling Laguna's shooting while he's in the air and following up with the Ragnarok Cannon which from what I hear is a japanese thing because of Laguna's and the Ragnarok's japanese names sounding similar which we wouldn't see on the English version obv.
Also apparently Laguna uses his machine gun, a rocket launcher, a shotgun and a sniper rifle as well as some kind of laser cannon which must be the Ragnarok thing.
Also, Vaan uses the Tournesol from FF12 in EX mode and perches on his sword for his victory pose, Laguna has his old FF8 victory pose

/ random crap in case anybody doesn't know it yet
