It was during this event that the southpaw puncher confirmed that he is now looking to make his ring return in September and will begin gearing up for that bout in the coming weeks.
The long reigning champion didn't give away too many details about the upcoming bout but it seems clear that he'll be remaining at Bantamweight for the contest and will be defending his title, for the 9th time. There is however speculation that it will be against highly ranked Thai Petch Sor Chitpattana (31-0, 20), with Petch's team having made an offer to travel to fight Yamanaka in Japan.
Although still in training Yamanaka did mention that he'll be stepping up his training as he begins to get more information regarding the bout, and will be heading to Okinawa as part of the training camp, a popular training spot for Japanese fighters and a regular venue for Yamanaka's training camp.
Speculation is that this may be Yamanaka's final defense of his title before he begins to really chase unification bouts and there is talk out there about him travelling to the US in 2016 to unify with IBF champion Randy Caballero or, if Caballero vacates, a large offer may be made to get Lee Haskins to Japan for a unification bout. That however is still "talk" and rumour more than anything too solid.