Miyamoto confirms that he will be showing off his new projects at E3

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Soundwave said:

First off people need to understand something, Miyamoto is the head of ALL software development at EAD. He is the General Manager of EAD. That's actually his official title.

So every E3 he brings his new projects to the show, this year is not any different from any other year.

I think people are assuming this is going to be his personal project like Pikmin was. Even if he resides over every project created by EAD, so does Iwata. We don't consider every new game with Iwata's name in the credits to be his "new project."