The KPOP scene has been upended the last month by the return of Big Bang (빅뱅). G-Dragon, Taeyang, T.O.P., Daesung, and Seungri (탑, 지드래곤, 태양, 대성, & 승리) are back and they released three new singles and three new videos in the last month. The songs are Blue, Bad Boy, and Fantastic Baby.
The videos are pretty consistent with their previous work and they all pretty good. Each song has a different sound and feel, so check 'em all out.
In general, I think the female KPOP groups have a greater chance of achieving international fame in the West, but if there was one male group that could make it big in North America / Europe, it would have to be Big Bang.