So here are some class predictions I have come up with.
Paladin: This prediction is based solely on the coop play that has been emphasized. What better than a party buffer and healer.
Priest: I think if they are truely making a rewarding coop play with distictive play styles a some what pure healing class may finally come into the mix. This would simply speed up the dungeon crawling. No waiting on globes.
Hunter: I really think we will see a non summoning class with a permanent pet arrive. The reason I see this as a prediction is simply the easy steal from WoW. They can have the customization options eaily based on WoW where the Hunter or the pet can be the primary damage output based on the abilities you choose.
Wants: I would like to see a rogue and a druid. I think what these classes have become in WoW would make them fun to play in Diablo. I dont really want to see the zon but there will be a need for a mage.