Korean sites Beta News and Mediot have brought forth some new details pertaining to Rockman Online. In addition to providing a few new official illustrations focusing in on Rockman X and Zero (below), both sites have confirmed the game as a 2D side scrolling action RPG with 3D graphics (comparable to that of Mega Man X8 and Maverick Hunter X).
Further, Online is said to take place within the Rockman X universe and its world will be populated by NPCs in addition to users. Capcom is still mum on a console, however it's speculated to be a PC release due to developer NeoWiz's previous efforts on the platform. At this time, the game will remain a Korean exclusive with no Japanese or Western release planned.
More details and screenshots of Online are expected to be released in the very near future. For now, please do enjoy the new official artwork!