Looks like it's on a brace in the back to hold it up. Still cool as f***. Would love to see a Unicorn Gundam (Final Battle Ver.).
Yup this is more like an animatronic puppet then an actual self propelled walking Gundam but I guess the gyroscopic technology to keep something this tall balanced to walk on it's own isn't there yet but hopefully soon lol.
Edit - On a side note robots in the military has already started... kinda creepy though.