Blizzard has recently broken the news that they are no longer placing copies of World of Warcraft on store shelves. The recent string of server outages and other server problems has caused them to make this move.
While Blizzard has been denying recent rumors that they had asked multiple retailers, specifically Best Buy, to pull World of Warcraft from store shelves, Blizzard representative Gil Shrif has been quoted as saying "We haven’t requested that any retailers pull the games they already have off their shelves. We’re just being careful not to release additional copies to be sold until we feel the game servers can support additional players." Blizzard’s official online store currently shows World of Warcraft to be out of stock.
After the poor server performance this past weekend, Blizzard also announced in their press release that "due to the extended nature of the server issues, we will be providing a free 48-hour extension of play time." Blizzard has refused to comment on how long the hiatus might last. There hasn't been any word as to if this decision will effect the upcoming Korean release.