The Corpse Explosion skill comes back, letting you blow up as many as 10 bodies at a time.
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After making some Diablo III announcements earlier today at Blizz Con, Blizzard shared even more information during a 20-year anniversary panel tonight.
Most significantly, the Necromancer, who returns from Diablo II, was discussed in more detail.
Whereas the Witch Doctor's summons are typically passive (you summon them and then forget about them), you can, for instance, activate a Necromancer skeleton skill to cause them to attack another target.
Resources are different, too: the Witch Doctor uses mana, but the Necromancer uses something called essence, as well as corpses left behind by deceased enemies.