From today's review, here are the two potential altmodes for Megatron:
Here's how the toy could have looked with more Megatron-y colors:
Megatron may not be in any of the comics, but presuming this toy's altmode is correct, we may at least see his inert body: in issue #4, as the Decepticon train races toward its goal, we see a huge artillery cannon mounted on one of the cars.
If you look closely, there are even tank treads stowed behind the train wheels. Is this Megatron, stuck in stasis lock? We can understand why Starscream would choose not to revive him, but why give him a modern altmode instead of just leaving him as whatever prehistoric/alien creature he already was? For that matter, why keep his body around at all?
