I guess it all depends on who has the most flexible schedule, and right now both KARA, SNSD, and T-ARA are doing tremendously well in Korean and I know at least KARA and SNSD have overseas promotions coming up and ver busy schedules, so unfortunately it might be either members of both groups who get replaced, at least temporarily. Narsh has a solo career and promotions coming, so it might be her as well, or Hyuna since 4minute is also starting overseas promotions as well. It's hard to say whose going.