According to http://shop.nick.com/The-Legend-of-Korra-Book-1/A/B009LDCUP0.htm as well as Amazon.com the Korra Book 1 Air DVD will be released May 21st 2013. Update/ February 8th, it seems as I suspected this was just an "Amazon Date" both Amazon and shop.nick.com have removed the may 21st date and once again it is just a preorder. Coming Soon was what the dvd trailer said back in December, more than likely the release date would have to be sooner than May to be classed as "soon".

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It is hard to say for sure if this is the confirmed date as Amazon have been wrong before, but the official Nick shop listing it is as close to confirmation as we are going to get I think. The image used here is also not yet confirmed to be the dvd cover, the image itself fits as a dvd cover IMO, though it lacks many of the usual features of a dvd cover such as any writing of what season it is. In summary, take this with a slight grain of salt, do not be shocked if it changes. If it is true then Nick really need to work on their definition of the word "soon" how is 6 months "coming soon" ? Thoughts ?