I'm on the fence about the single rune type, which smacks of the ongoing "dumbing down" of the game, but will have to see how this plays out.
Excited about the possibility of Unholy summoning multiple minions, but it reads like "two", and I would love to see that be more (doesn't have to be an army, maybe three or four?) - but now there's a possibility for a great set bonus ("Your Raise Dead spell now produces twice as many minions"). I'd be legit stoked to see four waddling around.
Through the entire preview, surprised to read nothing about changes to runeforging, which really needs to happen.