I've seen both the Japanese and the Korean version and I have to say that the Japanese version is slightly better; it gets right to the point whereas the Korean version has a bit of delay.
Nice to see they are making the effort to learn the Japanese language. However, isn't it a bit hard for Nicole? She had difficulty grasping the Korean language and now she has to learn another one. Maybe she needs a Japanese version of Star Golden Bell to help her learn better.
They'll probably replace Hara because of Kara's activities in Japan. I think they'll put HY from SNSD because of the current fame she is getting on variety shows.