Couple this with the battery stories out recently, and mount an AA-12 full auto shotgun on it, and you'd have a terrestrial combat drone.
Add in a few other things.
Developments in artificial muscles. No noisy pneumatics or hydraulics.
Flexible solar cells that can cover the cargo to supplement its power.
Improvements in low power computing and solid state storage.
Fuel cells (quiet power).
I'm sure we can think of other things.