This E3 is going to be so much fun for every company. I expect a great year for E3.
I think people are doubting Nintendo a little too much as far as what they'll show. If it's a 45-50 minute presentation that's way too long to fill with an indie reel, Mario Odyssey, Fire Emblem Warriors, Pokémon Stars, Smash port, Mario Rabbids, ARMS, Splatoon 2 and even VC with online.
Mario Odyssey should get the most screen time and I don't see it being more than 10 minutes. It's good to get a lot of info, but there's such thing as too much focus when it's a presentation that covers many games.
E3 2014 (one of the best ever) had
-Zelda (new game)
-Captain Toad (new game)
-Hyrule Warriors
-Splatoon (new game)- got the most time being 6 minutes
-Smash for Wii U/3DS
-Kirby and the Rainbow Curse (new game)
-Star Fox (new game)
-Xenoblade Chronicles X
-Yoshis Woolly World (basically a new game)
-Mario Maker (new game)
-Pokémon OR/AS
-Bayonetta 2
-amiibo announced
Geeez I forgot how many new games were announced. There was a lot to this. Splatoon got the most time and it was only 6 minutes. Reggie even talked for a few minutes too.
Games like Captain Toad, Kirby and Mario Maker got trailers and moved on.