I'm expecting something like a cement truck with a long arm and a multiple pass deposition process. Possibly foaming the concrete at the nozzle; if anyone ever gets that chemistry to work. It might well be called "manually operated", I'd anticipate someone at the controls at all times even if it can do some sections by itself, just for safety and "shit happens".

I'd also anticipate at least one person at the nozzle at almost all times, dealing with inclusions and inspecting etc.

Even this won't be cheaper or faster than current techniques, but the onsite foamed concrete extrusion might become popular enough to endure for insulation, looks, or other reasons.