Mark my words, Nintendo's will be disappointment central tomorrow. The end result will be that E3 was completely mediocre all around this year. The winner won't be important, because we will all have lost.
Sounds like the last 2 years(fixing to be 3) and you are probably right... Publishers aren't taking any bold risk at E3 or with games they release in general, we need something great from Nintendo to save the day outside of already anticipated titles(ones already announced, Mario, Zelda). Unfortunately I have to side with the trolls we are looking at a disappointment tomorrow(yes I hope I'm wrong).
The only reason Sony's and MS's E3 were "meh" and bad(respectively) is because they just announced titles everyone expects(like Uncharted).
Uncharted 4, LPB3, Halo 5, COD (My Lord I really have lost count.)...
So what if we get another Zelda, you know what is usually a generation defining game? Zelda, or a Mario title. How is another Zelda probably 4 years after the last one a bad thing? Smash Bros 6 years later? Maybe if Mario Galaxy 3 is announced it would be 5 years since the last one. I have no issue with Nintendo delivering these games. Because it is extremely rare that they disappoint. Plus it isn't we are getting a new 3D Mario, or Zelda game yearly.