While we in the U.S. won't be able to buy the new Peugeot 508, it's still worth mentioning as one of the most significant debuts at this year's Geneva Motor Show. Why? It's one of the most popular cars sold in Europe. Similar in size to a Volkswagen Passat, the new 508 features all-new styling inside and out. In Geneva, Peugeot debuted the 508 First Edition, which will be sold in limited numbers and only with the car's most powerful engines: a 225-horsepower gas engine or 180-hp diesel.