The colouring may suggest Galvatron, but if this is taking cues from TFPrime (Beast Hunters), that Megatron is grey and purple (more purple on the cartoon than on the toy).
The alt-mode doesn't help, nor does the yellow colouring.
Since the classic pairing of Optimus is with Megatron, and there is no current fiction featuring a Galvatron, it would be unlikely for Hasbro to use that character for a toy. Not impossible, but unlikely, considering their preference at releasing toys of marketable characters like Optimus, Bumblebee and Megatron.