Starcraft Online it's just rumor maybe diablo online much better this is confirmation from development :
The official story: These sentiments are bolstered by Blizzard's official word on the matter. "Our focus right now is on continuing development of Starcraft II and working our way toward beta," a Blizzard rep told GameSpot. "We haven't announced plans for anything called Starcraft Online, and we prefer not to address rumors or speculate on business operations that haven't been determined yet."