Blizzard cofounder Frank Pearce announced the new addition of an old hero class - Necromancer - for Diablo 3. The commander of the dead is one of Diablo 2's most beloved characters. Many Diablo devotees will glad to see good old Corpse Explosions, Skeleton Summons, and Bone Spears.
In order to unlock the Necromancer, players will need to purchase the Necromancer Pack (tentative name). Blizzard announced that the Necromancer Pack will be available sometime in 2017, while the anniversary patch will be applied on PTR next week.
Take a look at this video of the Necromancer reveal.
Find more information on the Blizzard Necromancer Overview page.