Diablo III has been delayed from a late 2011 release to now a vague "early 2012" release date.
While Blizzard hinted it was going to be tough to reach the original release date, they now say they are taking the extra months to polish the game up more and the beta will get extended for a longer period of time to help with the tweaks.
http://www.giantbomb.com/news/we-act...ablo-iii/3689/