What other classes to be featured in Diablo III besides the Barbarian and Witch Doctor is unknown at this time. More information will surely come at BlizzCon 2008.
Known Information
We have heard several statements saying that the Barbarian will be the only recurring character class from Diablo II, but that there might be a possibility for one or so class to come in an eventual expansion to Diablo III. We also know that the Diablo III dev team at once though about making a Dervish class, but no information if that idea is completely shelved. It seems highly unlikely that the Dervish would appear though, as Blizzard have avoided talking about upcoming classes, and they would be unlikely to mention the class in passing if that is one class that will make the game.
- The Barbarian is the only Diablo II character to make it into Diablo III release. He's quite updated in style and use.
- The Witch Doctor is a new character, similar in use to the Necromancer.
- The following characters have been confirmed to NOT appear:
- The Amazon will not appear in Diablo III.
- The Assassin will not appear in Diablo III.
- The Druid will not appear in Diablo III.
- The Necromancer will not appear in Diablo III.
- The Paladin will not appear in Diablo III.
- The Sorceress will not appear in Diablo III.
- Some of these seem likely to join in on an upcoming expansion, that has been hinted about [1].
- The conceptualised Dervish class will likely not appear in Diablo III.
Speculation
Blizzard replied to questions as to why the Necromancer was not included in the line-up, saying it's so similar to the Witch Doctor. Jay Wilson responded that the Witch Doctor shall be made enough different from the Necro that if they decide to bring the Necro in later, their roles will not overlap. Here is a quote on class design choices by Jay Wilson:
- We have other goals, where we want each class to be distinctive from one another, we want archetypes to be very strong—I should be able to tell you the name of a class, and you should know what it is, right away. You should have an idea of the kinds of things that that class can do.
It is likely that the next three classes will include a ranged, pure magic user and a melee/caster hybrid class, in terms of what roles are needed.
Additional Information
You can read more from the various interview, previews and articles about Diablo III in the Media Coverage archive.