In 2014 she did speculate in an Interview about a possible comeback...
---> en.wikipedia.org/wiki/Rio_Hamasaki
Her "retirement video" Rio Hamasaki - Debut and 1933 Days, AV Retirement(浜崎りおDebut~1933日そして、引退 AV女優最後の日にプライベートまで密着 完全撮りおろし), a five hour retrospective of her AV career, was released by SOD in March 2012.
However, in February 14, 2014, Hamasaki appeared in an online show speculating about a possible comeback.