tǎnkè is the Chinese word for tank. I've ordered this monster at taobao and today it arrived. I am looking forward to dismantle and hack it.
The inisde construction is quite interesting. There is a module called Multi Function Unit, which contains several motor drivers, sound effect, etc. The Multi Function Unit is controlled by just one wire, conntected to the RX, probably some kind of PWM.
More soon.