It was found in Mexico, along with Flex Changers Cheetor (one step Cheetor), which is also a new toy we never saw before. This Starscream does have a wavemate and it is a rerelease of the voyager sized Nitro Series Optimus Prime, which sports his Evasion Mode body. These Energon Igniter mold reuses are all part of a Autobots Unite subline which we are assuming is store exclusive, with good odds of that being Walmart.
Hasbro had stated that the voyager class velocitron Hot Rod was not picked up by Walmart which instead was prioritizing exclusives for the Rise of the Beasts film and this could be that exclusive line they are going all in on. Of course, that is yet to be confirmed.
The images of these new Mexican sightings were found here.