It looks like Square Enix is throwing an official Cosplay Contest to promote the new Final Fantasy XII.
You need to submit 3 photos of yourself in a FF12 costume by Sept 29th. The prize is a free trip to NYC to attend the FF12 launch on Oct 11 (You'll be in NYC from Oct 10-12) along with lots of FFXII stuff!
Check out the link above for full details.
I was reading over the rules and it seems they are only allowing FFXII costumes into the contest...
Um... I think it's a little short notice for most people, but hey. If you're fast or have a FFXI costume that crosses over to FFXII please enter! :)