
GameSpot's Most Popular games list is reporting that Diablo 3 's release date is set at December 31 2008.
This detail contradicts Rob Pardo's statement that the game would only be released in a year to a year and a half from now. But considering that Diablo 3 has been in development for 4 years, it could be entirely possible.

Diablo III Season 38 launched with Ethereals back, but players are reporting Error 395002, disconnects, and server trouble.

Diablo 3 Season 38 starts March 27. Here’s what to finish before Ethereal Memory begins, from class choice and stash cleanup to Conquests and Ethereal

Via Diablo’s global director of community Adam Fletcher, Blizzard is introducing new measures to improve the quality of season launches in the future. Across both Diablo 4 and the aging Diablo 3, fans of Blizzard’s games should all benefit.
If they didn't let the cellphone guy touch the 3rd one in first place, they wouldn't have to dance around like clowns trying to make money.
We've been asking for less "boring" seasons... "boring"... not "buggy"... same ol' rehashed content just a different color is not working.
I'm 100% sure that this is just a temporary placeholder.
I bet that it's going to be changed to 'TBA' very soon.
Blizzard keeps it's "initial projected" release dates about as often as a drunk keeps 20 dollars in an ABC store.
Sorry, but you can parous their database and see plenty of incorrect release dates. This is just a guess on their part.
There's no way it comes out this year. Starcraft II and Wrath of the Litch King have to come out first. I doubt Blizzard would release two brand new games and one expansion back for its big IP's. A year to a year and a half is optimistic in my opinion.
It won't be out this year, it's got another year of developement, as has already been stated.