I found out from a local source (I live in Indianapolis and attend the Indy 500 and Brickyard 400 each year, and attended the US GP F1 Races while they held at Indy) that Chevrolet has a contract with the Indianapolis Motor Speedway for X number of years to be the Pace Car (I can not confirm the number of years). So I anticipate that we will see more Vettes, Camaros, and future performance oriented Chevrolets Indy Pace Cars in the coming years.
While I love the Camaro and Vette, in years past there was high anticipation each year what the pace car was going to be - a new GM, Ford or Chrysler product? For now we can be assured it will be a Chevrolet.
I agree, this year's Camaro Pace Car looks great, and I am glad that they waited for the 2011 convertible to closely match the '69 Pace Car. I can't wait for May in Indy!