You people do realize that, in modern companies, it is a common practice to trademark any new ideas that come up just in case, right? A logo being trademarked hardly counts as a "leak"...
Apparently, news were leaked that Nintendo has trademarked a Pokemon Sun" and a "Pokemon Moon" logo. This caused people to immediately jump to conclusions ("NEW GAMES CONFIRMED!") but, again, trademarking POSSIBLE ideas that MIGHT be used in a distant future is a common practice for big companies.