I don't think Disney is going to risk their most popular new franchise with a yuri lead. It'd be awesome, but there's way too much on line. Hell, Korra had to leave it at heavy insinuation and comics, and that's a Nickelodeon cartoon.
BOIIIIII~ Ma ship, oh this beautiful, I can die happy. Mary putting her hand on Yumeko's hip, geeet it! Wait are they playing some sort of strip game?? Oh, please continue.