It has been years since Diablo III was first announced, but some fans will soon get a chance to try the game for themselves. Blizzard has announced that the Diablo III beta will begin soon, and has provided information on how people can join it. Both Mac and PC users who have Battle.net accounts can opt in for the beta using the Battle.net Account Management tools. That said, people who opt in for the beta are not guaranteed to be selected to participate. More details about the process can be found at Blizzard's official announcement.
While many may want to interpret this news as a sign that Diablo III will be coming out soon, such thoughts may be premature. In its announcement, Blizzard stated that it has not yet determined how long the beta will go on, and the game still does not have a release date.