i think they would probably go to the Pattaya Music Festival, their popularity (as well as many koreans celebs) have reach Thailand and many other asian countries. A Music event like that would bring in lots of publicity and who wouldn't want that, especially on a semi-world event.
I would think that they gonna debut in japan soon as well since japan is the biggest music market in Asia. And SM would definitely want to do that. of course, they'll probably be on Avex label just like their Japan-debuted SM-labelmates. Even though korea went through a girl group craze in 2007, with them and WG @ the head, i dunno how Japan would treat them...