According to today's comments Kameda intends to fight on,or around, May 7th, with Abema TV having the rights to the fight. The details of the over-all show are scarce but it sounds as if the show could feature the return of Tomoki Kameda (34-2, 20) [亀田和毅] and possibly also Kyonosuke Kameda (0-1) [亀田京之介] as well as Joe Blog (1-0) [金沢仁宏].
Kameda seems unwilling to be drawn on one opponent, but it appears he was willing to talk about a fight with former WBA Super Flyweight champion Kohei Kono (33-11-1, 14) [河野 公平], who beat Kameda in October 2015, in Kameda's last bout. A Kameda Vs Kono bout, in Japan, would do huge figures and could well be the easiest bout to make, though Kameda having the other opponent in mind means he may have an ace up his sleeve.
According to reports in Japan Koki's younger brother Daiki Kameda [亀田 大毅] is against Koki returning, but is unlikely to be able to stop his older brother from returning to the ring.