There was one particular concept, which got me. What looked like parts of the tank opening up, to reveal some kind of dish.
We know the Mammoth Tank is due to be getting upgrades in the form of Missile Pods and Railguns.. but I'd say the concept shows something else.
But what? Disruptor Panels? Shield Panels? Lights?

Alex, all knowing guru of Tiberium Wars, have you knowledge to help me in my quest?