W were supposed to have released their 7th single and 3rd album. Both were cancelled by Up-Front Works, the part of Up-Front that releases media, when Kago suspended herself/was suspended by Up-Front Agency.
As far as I know, Kago returning has only been mentioned in the - now deleted - comment on the Tower Records site. Until more and more reliable sources can confirm the Return of the Kago, it's still a rumour/prank/fill-in-your-favourite-word-meaning-probably-not-true.