I believe the car used for testing on the frozen lake in Sweden was most likely Thunder Gray -- at least that's what it looked like to me, in the videos.
The red car (EP 2, right?) that everyone has seen so much is definitely Radiant Red. I have not yet seen any Roadsters painted Fusion Red, but I know it's a solid (non-metallic) color and is considerably brighter than Radiant Red. It's much closer to traditional Ferrari red.
The black car, EP 1, I
think is Obsidian Black. It's a metallic color. . . But you have to really get it into bright sunlight to see the sparkle of the metal-flake paint. It's subtle. I've seen one or two close-up photos where it appears to be visible. The whole idea of a metallic black is pretty questionable to me, I've got to say.
Also a correction. . . The VP 1 is definitely
not Racing Green. It's "Signature Green", which is a kind of very dark metallic green offered only to the Signature One Hundred buyers. Racing Green is a lighter (but still fairly dark) solid green which hasn't yet been seen on a Roadster, but here's what it looks like on an Elise:
