According to Sports Hochi, Toshihisa Nishi's name is being mentioned as a possible candidate to join the Samurai Japan coaching staff.
After retiring in 2010, Nishi spent some time working as a part-time coach with an independent league team in the US. He is currently working as a baseball commentator. He also started the Nishi Baseball Academy and will begin a two-year program in Comprehensive Human Sciences, Health and Sports Sciences at Tsukuba University's Graduate School.
Source: Sports Hochi 10/10/2013
Sponichi adds that Nishi is being considered as an INF/base-running coach. Other names, like Akihiro Yano as battery coach and Kazuyoshi Tatsunami as batting coach are also mentioned.
Source: Sponichi 10/10/2013
Nikkan Sports notes that Yoshitaka Katori is the top candidate for the pitching coach job.
Source: Nikkan Sports 10/10/2013