Day notes that Google has already faced issues due to this law, with South Korea asking for all YouTube comments from the country be displayed by the user's real name. Google skirted the issue by disallowing any comments from South Korean IP addresses. South Korea has since exempted YouTube from the list of required sites under this law.
Blizzard's changes will affect the StarCraft II forums and eventually the World of Warcraft forums after the release of Cataclysm. Legacy posts and forums for older titles will not be affected and no existing posts will be tied to anyone's real name.
Blizzard's interests in South Korea are especially high given the popularity of the company's franchises in the country. Shacknews has asked Blizzard to comment, but none was received at the time of publishing.