It's not exactly news that Fiat Chrysler Automobiles is working on a new roadster based on the Mazda MX-5 Miata, but these new spy photos represent the first time we've seen a prototype testing with different bodywork that looks specific to the Fiat version. After lots of back-and-forth speculation that the roadster would be either an Alfa Romeo or a Fiat Abarth, FCA CEO Sergio Marchionne said at this year's Geneva auto show that the Mazda-based model will be called the Fiat 124 Spider.