Im struggling to understand why so many of you think the necro is an Expansion when its pure DLC, and even then I wouldnt call it a DLC.
Its nothing more than an "Unlockable Micro Transaction" imo.
Well, your opinion is fair, but almost all DLC is technically "unlockable" material.
DLC packs typically offer small story elements, and class tweaks.
Blizzard gave the class tweaks for free, but is using a DLC for a brand new class, which is far more than a Micro Transaction as the Necromancer could change several key elements of the game for longstanding players who care about the 4 man meta. It also shows that even though the game was thought to be dead, there are still some small and subtle plans for it.