Comes from an interview with Kimishima in today's Asahi Shinbun
http://www.asahi.com/articles/ASJ4Z0R76J4YPLFA002.html
Translation/summary from
https://twitter.com/FarmboyinJapan/status/731958459831226372
Some clarification
https://twitter.com/serkantoto/status/731989666761572352
Thanks to GSR for the fully translated interview
http://www.neogaf.com/forum/showpost.php?p=203756055&postcount=277
http://www.asahi.com/articles/ASJ4Z0R76J4YPLFA002.html
Translation/summary from
Kimishima hints that Nintendo is looking at a production system where "we can do as much as we can ourselves."
Kimishima also says that Nintendo would like to have it's first movie ready within the next 2-3 years.
https://twitter.com/FarmboyinJapan/status/731958459831226372
Some clarification
In the interview, Kimishima mentions the 1993 Super Mario movie as the reason why Nintendo is NOT looking at live-action movies.
Instead he seems to prefer 3D CD/anime-type content where Nintendo should produce as much by itself as possible.
Also note that he does NOT give a time frame. He says the first title won't be ready this year but also won't take 5 years.
https://twitter.com/serkantoto/status/731989666761572352
Thanks to GSR for the fully translated interview
http://www.neogaf.com/forum/showpost.php?p=203756055&postcount=277