The beta will shut down on May 1, prior to the game's release on May 15.
All beta accounts and character information will be reset at that time.
A Collector's Edition will also be available at retail, which includes the game's soundtrack, a two-disc behind-the-scenes DVD and Blu-ray set, an art book and a 4GB USB soulstone flash drive loaded with the full games of Diablo II and its expansion Lord of Destruction.
Blizzard is also offering Diablo III free to users who sign up for the new World of Warcraft annual pass, a yearly subscription to the popular MMO.
Watch Diablo III's opening cinematic below: