I remember hearing yesterday that they were going to a safer kind of car in 2012, and I think Wheldon was testing the car behind the scenes or something like that. I don't know what's going to be safer about the new cars, though.
EDIT: Okay, I found it. I was right...
Thirty-four cars were entered in Sunday's race, the last for the current Dallara chassis. In 2012, the series moves to a newer, safer car designed to increase manufacturer competition and individualism. Wheldon was the test driver for that car.
Link: http://sports.yahoo.com/nascar/blog/from_the_marbles/post/Where-does-the-IndyCar-Series-go-from-here-?urn=nascar-wp4554]Where does the IndyCar Series go from here?[/url] [Yahoo! Sports - The Marbles]