Well, its exclusive to Shopto.net and nowhere else, and the same price as some of stores for the regular edition. Check out the pic in the comments for content.
The speciai edition will contain "a set of limited edition postcards, as well as a comic book based on the game." There will also be a redemption code for a special in-game power. We suspect it's probably those Gigawatt Blades that are available as a pre-order bonus in the US. Judging from the image above, the cover art seems to be a new, more comic-booky design.