This is a really cool marketing event that GM is doing! Hehe i doubt GM would publish results if they loose

It will be an intresting race, have they stated how it would work? Is it a real race like the Best Motoring ones (starting grid with all cars and results based on final position and quickest lap) or just timed laps?
The CTS-V is cheaper and slightly quicker then the M5 (thanks to the big supercharged engine), those are pure facts, its a great car in many aspects, a huge step forward for a non German saloon IMO! But as an overall driving experience considering also engineering, quality, materials and smart solutions the M5 would be my pick any day of the week.
I think the difference in performance on a track would be so small though that a really good driver in an M5 would be quicker then a good driver in the CTS-V, should be an interesting race! Hope they publish a video from the event!
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