Blizzard announced today that those who buy a digital version of Diablo III through its online store will have to wait 72 hours before they can play the unrestricted full version of the game. During that time period players will have access to Act I up to the Skeleton King, a level 13 cap, and matchmaking only with other Starter Edition players. Global play will also be off limits and anyone attempting to play the Starter Edition in an outside region will get an "error 12." The auction houses will also be off limits. You can learn more about the Starter Edition here.
"We apologize for the inconvenience, but it is a necessary step to combat fraud and other malicious activities that can weaken everyone's play experience."