...but he's staying with the company, so don't worry.
In an
interview with Wired, he says that he'll no longer be supervising a huge number of games that take years to complete, instead focusing on developing smaller projects, or perhaps something that he designs entirely by himself.
Miyamoto, whose creations propelled Nintendo to worldwide prominence beginning with 1981′s arcade game Donkey Kong and who is generally recognized as the world’s most influential and creative game designer, said he felt comfortable stepping away from supervising the Mario and Zelda games because his staff has done such a good job with this year’s critically acclaimed entries in both series.
I'm really interested in seeing what this does to the company. Obviously I'm really excited to see what kind of games he starts designing. I assume the first would be the new IP he's been talking about, but it'd be strange for it to be developed by a tiny team (or no team at all) rather than by major Nintendo resources. As for the franchises he'll be leaving behind, it should be interesting to see what they decide to do without him. What do you think?