So far Blizzard has announced 4 of the 5 character classes.  Unlike D1 and D2 but similar to World of Warcraft, you can choose a gender for your characters and will not be restricted.  This article will describe the very basics of what Blizzard has announced for these four character classes.

Witch Doctor: The Witch Doctor has five major skills that have been announced:

• Firebomb
• Horrify
• Locust swarm
• Mass confusion
• Soul harvest

From the gameplay videos the witch doctor looks like a sorceress / necromancer hybrid, without any sort of undead summoning but strong dark arts spells (similar to the necromancer).

“One of the things that we considered when we were working on the visuals for ‘Diablo III’ is the fact that color is your friend. We feel that color actually helps to create a lot of highlights in the game so that there is contrast. A great analogy is like in ‘Lord of the Rings’ — not everything is dark. It allows you to see what a creepy dungeon can be like but if everything is dark it doesn’t allow you to have a lot of contrast. Diablo I and Diablo II are darker, and I think that the one of the main reasons why is the fact that in ‘Diablo I,’ you’re basically in a dungeon the whole time. And in contrast to ‘Diablo III,’ you’ll be exploring outdoors, you’ll be in dungeons, you’ll be experiencing so many different areas."