Can’t say I’ve ever really paid any attention to the group, but if this is legit (and I think it is) it is very very cool. Sounds like a K-Pop song, I’m actually a little impressed with their pronunciation. Maybe they’ll make it big in Korea? Who knows. I hope this is the start of a trend.

EDIT: It is them, you can buy their digital track through some Korean music stores. Here it is on Melon.