Today he arrived back in Japan and stated that he wasn't able to make excuses because he lost but that he was going to continue to fight on, and it was obvious that he feels he's good enough to become a world champion down the line.
Unfortunately Ishida's performance against Yafai failed to really impress, as he would have hoped to. Despite that it was very obvious he does have a lot of talent, with his confidence and general pacing needing improvement. Hopefully the loss will help him develop on those flaws, as it was obvious that he troubled Yafai with his his speed and size, but lacked the power and belief to beat the Englishman, who had been an almost unbackable favourite.
There is no news on when Ishida will return, but he didn't seem to take much damage against Yafai and could well return either vey late this year or very early in 2018, as he begins to his journey toward a second world title bout.