Kadokawa Shoten has confirmed that the limited first edition of Nagaru Tanigawa's next Haruhi Suzumiya light novel, The Surprise of Haruhi Suzumiya (Suzumiya Haruhi no Kyōgaku), will ship on May 25 with a special booklet containing a short story by Tanigawa about Kyon's middle school life.
According final issue of The Sneaker, the booklet's short story is called Rainy Day, and it is set during the protagonist Kyon's time in middle school. Tanigawa had personally written the "Someday in the Rain" episode of The Melancholy of Haruhi Suzumiya, which serves as the show's finale in the DVD and chronological order of the show.
In addition to the short story, the booklet's 64 color pages will feature illustration work by novel artist Noizi Ito, contributions by artists Gaku Tsugano (The Melancholy of Haruhi Suzumiya manga) and Puyo (The Melancholy of Suzumiya Haruhi-chan), and a behind-the-scenes account by the original editor of the light novel series.
Since The Surprise of Haruhi Suzumiya is 600 pages in length, it will ship in two volumes in Japan; the limited first edition will shrink-wrap both volumes along with the special booklet. Asides from that, this new light novel will receive a simultaneous worldwide release, but it is not shipping on May 25th (the day of its release) in all 13 countries that the said light novel series is in print but on select countries, namely: Japan, Taiwan, Hong Kong and Korea.
Source: Moe Ota-News Sokuhō via Anime News Network