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Set to be based on the Japanese Collection X/Collection Y
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Included in the Korean Evolution of Chespin, Fennekin, and Froakie Half Decks is a promotional insert advertising the release date for the first Korean XY expansion: X Collection • Y Collection. The set will presumably be based on the Japanese Collection X • Collection Y, and will be released Mar. 20, 2014.
The X Collection is currently known to include Professor Sycamore, as the official site and a second promotional insert mentioned the XY rule changes that were revealed for the rest of the world in September 2013.