Retailers have had them for days. Web retailers like Ebworld.com and Gamestop.com have already shipped.
We've received an internal e-mail from a "well known retail chain" employee that gave them the green light to distribute the discs now.
Stores in on the deal are currently breaking the release date for the Zelda bonus disc. Call your local retailer to see if you can get your pre-order bonus early!
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All of it culminating with a boss battle against Shredder at the end.