Yesterday there was a bit of an Internet furor over a new policy Blizzard instituted that required buyers of the digital version to wait up to 72 hours to access the full game (though they may still access a demo with some restrictions.)
Blizzard maintains that the precautions are necessary to ensure the safety and security of its players. Especially in light of numerous fraud and hacking attempts that have come to light since the game's launch. They also do this to try to deter gold spammers from hawking their wares.
"Similar to World of Warcraft, these restrictions were put in place to deter credit card fraud, which in turn helps reduce gold spam and other harmful activities that can have a negative impact on the game experience for everyone," said a spokesperson for Blizzard to Eurogamer.
They said that the restriction is an "unintended consequence," and they are "working to correct this as soon as possible and will provide another update when we have more details to share."