[bits of pieces] Ya-ya-yah --> Hey! Say! JUMP

just curious..
I just watch Shounen Club July 2007. There's 2 members of Ya-Ya-Yah, Kota Yabu and Hikaru Yaotome. This Hikaru is cute. Anyway, so these two are now in Hey Say! JUMP. What happened to Ya-Ya-Yah? Yabu and Hikaru will be like YamaP that has more than one group? or disbanded Ya-Ya-Yah?