According to a recent interview
translated by TheHylia, Miyamoto is now starting to build up his "sister-meter." Previously, Miyamoto spoke at GDC about increasing his wife-o-meter, and using it as an indicator of how successful his games were at attracting non-gamers and people who never played games before. One can only assume that Miyamoto feels that progress on that front has been good, and is now turning to convert another close non-gamer with Phantom Hourglass.
The relevant quote below:
Quote
Finally, some words to my sister (laughs). Link is cute, really; particularly this Link with cat eyes. I'd like you to watch the characters animated in a 3-D world on the DS screen. This game doesn't use the complicated cross pad, so anyone can have a fun adventure intuitively. Please, give it a try.
Hardcore gamers, eat your heart out. Miyamoto cares more about his sister than he does about you.