Rockman Online, first announced in June 2010, has most likely been cancelled. Updates about the game, which used to be frequent, have all stopped in the past several months; the company handling the project has seen a major downsizing in operations a few months back while an artist affiliated with the project claims that the team has been disbanded. This person has posted previously unknown art, which can be seen here.
As a reminder, Rockman Online was supposed to be a social mobile RPG expected to be released in Korea. It was being developed by Neowiz under a license from Capcom.