It appears that even without an official release date, retailers are not wasting time listing anything Tron on their site. On a not so strange fashion, Amazon.com has made several listings for Tron: Legacy already with four different disc configurations. It seems that Tron: Legacy will come in four different flavors: 5-disc Blu-ray 3D/Blu-ray/DVD/Digital Copy/Tron Classic, 4-disc Blu-ray 3D/Blu-ray/DVD/Digital Copy, 2-disc Blu-ray/DVD, and a limited eidition Identity Disc that will include the same discs as the first 5-disc edition mentioned. That’s just what’s available on Amazon, no clue what other retailers will offer yet.
Also, look at what other countries have listed in their sites!