Doesn't sound like much is changing:
http://variety.com/2015/biz/asia/nintendo-appoints-tatsumi-kimishima-as-president-1201592883/
“The basic direction and strategy won’t change,” Kimishima said. Takeda and Miyamoto will be in charge of software development, while “I control administration,” Kimishima said.
Sounds like he will handle more of the business stuff, but not really company philosophy or direction.