Inferno faction discussion.

I think there will be incubi after all. It's unlikely they'll bring back Magogs (50% new creatures, and "we won't go back to those awful units from the third game that don't fit anywhere!!!111" – which is a shame).
And yes, I want imps.

maybe they gave them a whip for aesthetics

Maybe. But I'm sure the succubus will be a mage.