ok guys, i was going to say something when i first saw the trailer but after watching it several times, i now know its true. so the kingdom key are the gun's and they most likely gave us a chop up version of the trailer they showed at D23, they probably actually saw the kingdom key transform but didn't release it for it might spoil the story in some way that he does it. so 1 reson that its the kingdom key is if you look at the handle on the gun you'll see that it looks like (kind of) the top of the kingdom key, the crown. and the 2 reson, the bigest one is if you stare at the handle of the right gun near the end, when its about to go to the ship, you'll see a silver chain, a chain with a mouse on it, the same chain the kigdom key has. to see it you might have to(you will have to) keep pressing pause in the first part of the trailer until it's faded to the ship. this could mean that they have rescued terra and he told him how to do it or aqua could have told him, because if it was her it would explain why his using fire so much. AAHHAA!!! I just though about something while i was typing this, i was going to say maybe its a finish command like in bbs, but now thinking about it, its probably is a command style. think about it, sora used fire a lot in the trailer, in bbs you would have to use fire and fire attacks a lot to get firestorm, so it explains why he used it so much. so it probably is a command style for fire, thus that why thats the only thing he used in it.

Edited October 16, 201312 yr by Keyblade master26

Well.... Maybe when Sora used Valor form in KH2 and it became guns...

 

Maybe its a small sneak peek that Forms or somethin similiar are coming back... Thats what i thought when I first saw it

seems legit to me ,Nya~

I think it's a type of form or command style.  It looks like Sheriffs badges around the name "Two-shoot Blaster"(think it was that name, similar enough), pistols are the weapon of a cowboy, they look futuristic like a Space Mans (with the revolving claws), I think it's like a conjoining of both Buzz and Woody style attacks, like a new form of summon melded with commands.  

It was probably a command style or just them showing that they've been thinking about adding blasters in the game

He uses the oathkeeper keyblade as guns.

I think it wont be a drive because back in kh2 when you used a drive it would take away one of your party members. While he was using the two gun donald and goofy were still fighting and running around him. I think it will be some thing from birth by sleep. In the trailer he shot 2 fireballs and then started hitting. Then it cut to when he was shooting fire balls out of his guns. So thats my opinion on that.

seems legit to me ,Nya~

I was gonna say that.