Various Japanese stores have begun posting information about the upcoming third Japanese Pokémon Trading Card Game expansion for Black and White. The expansion set will be split in two theme sets: Hail Blizzard (ヘイルブリザード) and Psycho Drive (サイコドライブ). Hail Blizzard appears to feature Kyurem while Psycho Drive seems to feature Mewtwo. The expansion set will be released in Japan on September 16, 2011.


Source: http://item.rakuten.co.jp/bigbe/52829/

Seems a little early for Mewtwo!!