Virtually none. If it is a new car and has been sitting on the lot, it should still be in good condition. Just make sure the mileage reflects that it hasn't been driven more than you'd expect.
Dodge's manufacturer bumber-to-bumper warranty is 3 year/36,000 (Drivetrain is 5 year/50,000 I believe but you can double check). These warranties start when you drive it off the lot, NOT when the car gets there. Make sure the dealer doesn't try to say the warranties have already started.
Otherwise, you should be good to go!
Are you sure it's still for sale? If yes, have you driven it? Does it smell--literally? Ask the dealer why it hasn't sold and he hasn't taken it to the auction. If you are still interested, run a Carfax report via the Internet by its VIN number to see its history and ask your mechanic to look it over.
〉 Answered on Sep 24th, 2013 by Georgia Brown, Director of Education at National Independent Automobile Dealers Association (NIADA)