The Energon Megatron Tank Question

Pictures of Energon´s Megatron appeared today. As usual, some fans thought it was great, and some fans complained about every possible aspect of it (what else is new?). But everyone was asking "What´s the deal with that tank thing he comes with?" Now, if Hasbro hadn´t made it very clear that I can´t show you guys unfinished prototypes, this would be simple, BUT, instead I´ve got to verbally explain.

Megatron includes a small tank that´s a dead-ringer for Armada Megatron/Galvatron´s tank mode. It´s not clear if it´s able to Transform or not. Without giving anything away, it might have something to do with the interesting way Armada ended...