Nintendo:
-Obviously Odyssey.
-I think this could finally be Metroid's year.
-Whatever the fuck Retro's doing finally shows up.
-Sun/Moon's third version for Switch and it's rad as fuck
-Mario vs Rabbids
-Ubisoft surprises everyone with a new Rayman, to release next year with Legends Definitive this year to prime you for entry
-Pikmin
-A whole buncha stuff they already announced is revisited
-finish on new smash (new-ish anyway)
Microsoft:
-SCORPIO ERRWHERE; everything demoed on scorpio
-Ori sequel
-Rare does some Sea of Thieves stuff, then Banjo-Kazooie, but it's monkey-pawed somehow
-Halo
-I know basically nothing about Microsoft's line up and expect most of it will be new
Sony (this one's more of my personal dreams):
-God of War starts us off again, something setpiecey to show that it's not entirely detached from old GOW. Summer 2018 release date revealed.
-Dreams
-SPIDER-MAN
-Ape Escape: Subtitle Involving Monkey Pun announced, utilizing all the weird shit on the PS4 controller no one else uses well, maybe optional VR.
-Ape Escape 3 on PS4 right this second to get you in the mood.
-Sly Cooper: The Movie trailer.
-But E3 is about games, says Sony Person, and thus, Sly Five, which isn't based on the movie. This fall. Sanzaru.
-Jak and Daxter are back in a new game, and it's out next Spring. The PS4 versions out this fall are to lead up to it. No idea who'd be developing.
-Crash N. Sane Trilogy is shown. Big focus on Coco's levels from Warped mixed into what's essentially a launch trailer. Reveals fully-playable Coco as opposed to just-some-levels Coco.
-Sony Person says "But that's not all." Trailer starts playing, Japan Studio logo, then the shocker: Naughty Dog logo. Crash Bandicoot sequel for May 2018. Behind the scenes it's obviously mostly SIEJ. Activision has 'approval rights' obviously but it's mostly Sony handling it.
-"Oh, and if you like kart racing we'll see you at PSX."
-COD WW2 showcase.
-Big Ol' Destiny 2 showcase.
-Kingdom Hearts 3 shown off, Summer 2018 release date that no one believes they'll hit but they eventually actually do and we look back on this as the god-king of E3s
-Uncharted Lost Legacy near-to-launch showcase.
-TLOU2 no-shows
-Indie game showcase to buffer and wind down the conference with some rad shit
-Sony Person says "Oh, so many great characters and franchises here on PlayStation. They should get together like this more often!" All-Stars 2 announced. May or may not be a smash clone like before, some kind of crossover game is the point.
-The trailer ends with Classic Spyro showing up to join the fray, and then Sony Person says "That's right, Classic Spyro is back. More on that in the near future. Thanks for joining us!"