from someone who researched. These are not official:
Vanu wrote...
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1. Barbarian
+ Takes the position of a melee warrior and brute.
2. Witch Doctor
+ Takes the position of a spirit shaman with added abilities of necromancy including parts that focus on either healing, support, or summoning.
3. Druid
+ (From what I've seen based on art, trailers, locales, and what would be in such a continuation... it seems that a Druid is most likely going to be in it, as that brings together a hybrid capable of becoming melee, summoner, or elementalist, or other forms depending on the changes that the skill sets will receive.)
I'd also like to point out that since druids aren't enemies that putting a druid in the art trailer really did fortify this assumption.
4. Sorcerer
+ (Seeing as how this is one of the default classes that has stayed in the series since its creation, it makes perfect sense that they would keep it, especially since the "magic user" is one of the main mindsets that possible players will be under.)
Seeing as how the term Sorcere(o)r is one of more powerful magic control, but less versatility and numbers, it makes sense that with the line of thought that the game has gone in terms of how they are looking at classes, that they would stay with this name and just branch the gender-esque name.
This is further fortified by the fact that there is a picture of a "Magi" in the art trailers as well... though as we learned with the Sorceror Boss, that could just be an npc or enemy... though it makes more sense that it was a possible sketch of what one of said class would look like.
5. Assassin
+ Despite my disregard of anything that "hits" people physically, or relies on pure physical force to win, it is obvious that the rogue and hence the assassin, is an integral part of the series, and thus an assassin makes a logical counterargument towards class inclusion.
The only class which I actually have no physical proof... it does bring the hybrid sense along... although I would hope and most likely assume that the stealth element would be given more consideration, allowing for a greater effect for single player or group player rogues, not basing off of WoW elements or other stealth / gank traits, but more towards what rogues have been in the older Diablo series, and of course what they have been in other RPG games.