StarCraft.IncGamers.com have looked further into the "new" (or at least updated) worker units of StarCraft II:
"While they toil away their lives (or warranty) for thir masters, and being sent away on suicide scouting missions, they still manage to take pride in their work, and always fulfil the task the omnipotent shadowy authority figures tells them. They deserve a bit of appreciation!
Well, perhaps we won't go that far, (they might be getting ideas), but at least check out the workforce of StarCraft II! Here is a preview of the StarCraft II Probe, SCV and Drone."