As far as Nintendo's physical appearance at E3 is concerned (their Nintendo direct will hopefully focus on other stuff), they will only have their up coming console Zelda title to show and playable on the show floor. This is a statement they released today:
Also in the news, Zelda won't be coming out for either Wii U or NX till 2017. Meaning it has been delayed once again.Nintendo changes its approach to the show every year. This June, Nintendo will focus its attentions on the upcoming game in The Legend of Zelda franchise. The Wii U version of the game will be playable for the first time on the E3 show floor, and it will be the only playable game Nintendo presents at the show, in order to provide attendees a complete immersion. Additional information about Nintendo’s E3 plans will be announced in the future.