It seems Mega Man 9 will only appear on WiiWare and nowhere else. Capcom had made a mistake adding it to their E3 lineup, it has been removed.
Source: Kotaku
QUOTE said:WiiWare ONLY - False alarm. Please, go ahead and disregard this morning's post regarding Mega Man 9 being available for the PSN and XBLA. Capcom have since removed those listings from their E3 lineup (calling it "a mistake"), and have confirmed the game will only be appearing on the Wii.
Source: Kotaku