The Lightning Returns demo is out now on Xbox 360 and Playstation 3! Which means free DLC costume(s) for playing the Lightning Returns demo!
Here's a description of the demo from Square Enix:
The demo puts players in control of Lightning as she traverses the chaos-infested Yusnaan palace of her old ally, Snow. Players will experience Lightning’s new customization options and master the game’s completely overhauled battle system. For those who activate the Outerworld services and submit their battle scores of the final fight against Zaltys, the ‘Siegfried’ outfit will be unlocked in the full retail game.
The "Outerworld" is social media related. Submit your score of the demo's final boss (share it with your Facebook friends!) and you'll receive the costume of Siegfried from Final Fantasy VI.
There's an additional DLC outfit exclusive to North American Playstation users called the Utsusemi Garb which can be acquired simply by playing the demo.
I don't believe there's any sort of confirmation that the
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