Geico Racing has an official Press Release out saying that Casey Mears will be the driver of the #13 car for now.
Robby Gordon will back next week at Montreal in a Nationwide Series car.
This translated link says that at Richmond Mattias Ekstrom is the possible driver for Red Bull Racing at Richmond.
I got this sent to me in an email:
They are running a contest where one of the prizes is a trip to Florida for a Sprint Cup race where you will be able to meet both Richard Childress and Clint Boyer, plus you will be in victory lane i9f Clint was to win the race.