Last month, Chevy announced that the long-awaited RS variant of the popular Sonic  would make it's official debut in Detroit. With this addition, the trim levels available on the 2013 Sonic rises to a total of seven. That means that this little hatchback is not just fun and affordable, it's now even more versatile and dynamic, to boot. And, we're happy to say, debuted in Detroit last week and the critics are...