Official unboxing of the Megatron HISS tank crossover at Geekculture (and mirrored here if that link goes)... showing that it is a big toy, with a fairly simple transformation and LOTS of kibble in both modes (it looks like most of the had and chest of Megatron sticks out the back of the tank mode).
The Baroness toy is inside the box in its own sealed backing card, which I though was strange, as it makes it look like a separate bonus toy, rather than a 2-pack of partner toys (because the Megatron toy isn't similarly boxed as a separate toy).

(this will be the third official Baroness toy in my collection, despite never collecting any GIJoe toys - the first one was for the GIJoe/TFs SDCC set, and the second was from FunPub in their final year as part of their Gen2 comic themed pack)