Yes, it is Shinoya. She's already 30 this year, while Yamashita still has a few years left for him. It looks like Yamashita will try for MD with Midorikawa. The pair won the Ranking Circuit in June. However, Midorikawa is still playing XD with Saito and they're in Team A so it will be hard to make the MD partnership work since the MD pair's ranking is nowhere near the top 32.I know about everyone you've listed, except for Yamashita/Shinoya. May I get more information as to why they've retired as a pair? Is it Shinoya retiring or is it something else? I thought that they were pretty solid as a pair on their good day and were generally helping to raise the overall quality of Japanese XD standards (which, by international top tier standards is quite low).
Kaneko/Matsutomo have not called it quit yet, and Japan has a 5th and younger pair (Nishi/Sato) currently in Team B but is already in the top 40 after a year on the circuit. They'll probably get promoted to Team A next year.