It's coming soon, very soon.
Through a recent posting on the Capcom Blog, the release date of Mega Man 9 has been revealed for North America. This coming Monday, September 22, the game is said to be hitting the WiiWare service. As usual this date is subject to change as the only official release information is provided by Nintendo's own Wii-kly Update.
The game will also be appearing on the Playstation Network and Xbox Live Arcade shortly thereafter, on September 25 and October 1 respectively. No word was given on release in other regions, though the Japanese release has already been set for September 24, two days after the North American release.