I watched the trailer again. It was Ventus fighting the squid Unversed, to clarify, Kitsune~ xD
And the board he's flying on definitely looks like it's formed out of pieces of Ven's Keyblade. You can go look at it since it's still on the front page: The yellow part on the underside is a part of the Keyblade's hilt; the gray-colored prongs jutting from the side of the main platform (like wings) are the teeth of his Key. It can also be assumed that this is a form of the Keyblade because he's attacking the Unversed directly with it... Not that such a thing is impossible with an ordinary craft (like Sora did with the skateboard in Kingdom Hearts II) but it seems to make more sense that it's a Keyblade, don't you think?
Granted, I'm a little taken aback at the thought of a Keyblade being able to change into different forms (like vehicles). It just seems really weird... But if Birth by Sleep properly explains it, then I'll be okay. o_o;;
Also, as a side note, DON'T THOSE GAMEPLAY SCENES LOOK FUDGING FANTASTIC? D: Something interesting that I've noticed but haven't gotten a chance to mention is in battle, it seems that the enemy's entire body is vulnerable, instead of just the targetable area (usually their head or something), which makes a lot more sense. >_> I used to want to smack Darkside's feet around, but I had to wait for the hands. >:0
Gosh, I want to play this game.