There are only 2 new keyblades, Winners Proof and Two Become One. Some of the pointless keyblades such as Gull Wing have been nurfed.
Winners Proof has +5 str, +7 magic and the ability EXP-Zero. Two Become One has +5 str, +4 magic and the ability Light and Dark which increases your chance of becoming Anti or Final from when you drive. They're obtained from the Mushroom XIII and Roxas battle respectively.
Everything different about the game is listed here.