In a recent interview at Ten Ton Hammer, Nexon America's Min Kim spoke out about some of the company's plans for upcoming games, including their online FPS entitled Combat Arms which will be entering closed beta next week. He also talks a bit about another upcoming MMO title being produced by their Vancouver studio, but details are still not available.
In addition, Min Kim speaks at great length about some of the existing titles they have have available in Korea, that they're hoping to port to the North American audience, including the wildly-popular Korean title KartRider. To garner interest with North American players, Min Kim realizes that the audiences are different, and social competition is where it's at. No other information was said about KartRider's introduction to North America, but he says more details will be available soon.
Update: Though we initially listed both Audition and KartRider as games Nexon was looking to bring to North America, Audition has been available to North American audiences for some time now, complete with a catalog of familiar songs!