The Jeep recall affects 67,872 Wranglers equipped with automatic transmissions. According to a bulletin from the National Highway Traffic Safety Administration, studies of those vehicles have shown that debris can accumulate in the transmission skid plate.
The problem is that the skid plate is located very close to the catalytic converter. If debris builds up, the heat from the converter can cause it to catch fire.
The company notes that the Wrangler owner's manual instructs owners to clear debris from the underbody, which would presumably reduce the risk of such fires.
Chrysler replaced the skid pan in late 2010 with a skid bar as a weight-reduction measure, so only 2010 models are affected. The company had relocated the catalytic converter that year, bringing it closer to the transmission.
Chrysler has said that it will begin addressing the problem immediately, and owners should receive official notices about the recall later this month. At that time, they'll be able to take their vehicles to a Jeep dealer, who will replace the skid plate with a skid bar.
If you have questions in the meantime, you're encouraged to contact Chrysler at 800-853-1403 and ask about recall M22. Or, if you prefer, you can ring NHTSA at 888-327-4236 and inquire about campaign #12V216000.