I asked Toy Guru about the variants in this wave and he said there is the Red Tornado and one other that well will discover " on the shelves". But he said it is not Batman for sure. So take a good look at the Penguin, Orion, Demon cause it's one of them.
This is what Toy Guru told me:
The other one will be discovered on shelf. It is not Batman. And it is only a minor paint change to a face.
Given this, it's possible that there could be an alternate Metamorpho head out there.