Thanks to Demonac, who pointed out that the new DotM Mirage Legion toy (wave 2 of the TFPrime series) is just a redeco of TF2 Sideways toy (with modified hands), he had me worried that the only "new" Mirage toy for DotM (the Speed Stars vehicle) was not a new mould either.
I looked, and was reassured that it was a completely new mould (top and bottom - compared to Leadfoot that was a redeco top and new bottom), but I did notice on the bottom under the robot sculpting, something interesting.

Every Speed Stars toy has the character name under the robot sculpt... except Mirage. Instead, it says... "Europeansports" as if a place-holder name was used by accident, while Hasbro were waiting for the final name to be confirmed by Bay (and no one noticed before it went into production).