Auto-turrets appear in Nova Covert Ops with their pre-LotV statline. These auto-turrets possess a unique skin and portrait.  It gets replaced with railgun turrets upon selecting the Magrail Munitions upgrade for the raven.
As auto-turrets have been removed from Versus, this can only be accomplished in custom games set on Wings of Liberty or Heart of the Swarm expansion level, in spite of still remaining in the Ranked/Unranked category.
↑The Targeting Drone is similar to the Auto Turret in the fact that it does not have a timed life. It currently costs 50 energy to deploy and has 120 hitpoints (all subject to balance of course). The Targeting Drone can target one unit at a time, and increases the damage that unit takes by 50%. You cannot have two drones targeting the same target. These drones are also flying, stealthed, and immobile. They may excellent perimeter defenses and can be coupled with Auto Turret raids to maximize the damage. Karune. 2008-10-16. Karune : Targeting Drone. Battle.net StarCraft General Discussion Forum. Accessed 2008-10-17.