Tomorrow, June 9th, is Rokku Day in Japan. As outlined by Devroom liaison Greg, the ninth day in June yields the following pun: "in Japanese, "6" (roku) and "9" (ku) are pronounced "rokku" when combined. Moreover, MegaMan's name in Japan is "Rokku."
Rockman Day has quickly become a bit of a holiday amidst the Japanese fanbase. Beginning as an internet meme around two years ago, a variety of fansites and blogs recognize the day, albeit without a specific means of celebration. Nevertheless, the Devroom, in honor of the day, is planning a surprise.
Rockman DASH 3's main composer, Uratani, was appointed as the "Chief Rokku Day Stirrer-Upper", a task that will take him off of his regular composing duties to try his hand a running the devroom tomorrow. As such, according to Kinako, he'll be preparing a treat for Rokku Day.
With Uratani leading Rockman Day, there's a subtle implication tomorrow's surprise is music related. A taste of the game's soundtrack, perhaps? We'll find out in less than twenty-four hours!
Source: Capcom Unity