As Jay Wilson, chief designer announced Diablo 3 in an interview that there would probably be no major changes to the "bright colors" in D3.
He was with the critical D3-petition ("dark power D3") and some screenshots face, which he also commented the same. All images were processed using Photoshop and in this perspective technically not at all feasible. Excessive light / shadows consume in a 3d game just too many valuable resources. Since D3 but should run on older computers, such was quickly discarded.
Other Fan Pics would be through lack of contrast, too confusing, since the Spielchars hardly stand out from the background, so Wilson.
When you pull all the color out of the environment and you make it too homogeneous across the game, Essentially what you're doing is you're pulling away the player's reward of feeling like they've progressed: because the area they 're in now looks like the area theywere in 30 to 45 minutes ago.
OK, that's very clear. It looks like Blizzard will not be put out of the nearly 50k signatories of the petition and continues to pursue its course.
Source: Interview on MTV Multiplayer