I had another look at the official images and I think it is just a mock-up with the main cassette sticker missing, because the "cassette" stickers are still on the legs, but the legs are on the wrong sides - those stickers should be on the outside of the legs in robot mode, and the cassette mode in the packaging photo shows those stickers being on the same side as the robot chest (and the cassette mode out of packaging shows the "cassette" side with the sculpted sides of the legs which should be the flat sides).
I hope it is just a mock-up, otherwise, it's an odd waste having an identical common toy released with the two rarities that just drive up the price.