Hello. As it is currently stated, E3 2020 has been canceled. Nintendo's E3 Direct is on indefinite hold. We don't really know much about what will come with this year. I do know some of what Nintendo is planning. However, we need to get some things out of the way. First of all, I do not work for Nintendo or any of their subsidiaries, nor am I affiliated with anyone who does. Second, I will only be discussing first party titles. And finally, I don't know everything about what's coming. However, I will be sharing what I do know.
>Super Mario 3D All Stars will include Super Mario 64 Definitive Edition (a combination of the OG and DS games), Super Mario Sunshine, and both Super Mario Galaxy games. The collection is set to be released on Sunday, September 13th, 2020.
>A new Mario Kart will be releasing in December. Nintendo wants this to be a sequel to Double Dash, as they want this Mario Kart to be different to 8 Deluxe.
>Paper Mario: The Origami King will bring back the partner system. They will introduce new partners, as well as bring back fan favorites. Releases July 17, 2020.
>The port of Super Mario 3D World won't come out until next year. Yoshi will be added, as well as two more bonus worlds.
>A new 3D Donkey Kong game is in development at Retro. They are also working on Metroid Prime 4, which is scheduled for Summer 2022.
>Breath of the Wild's sequel will be the first game in the series to have a playable Zelda, as Dark Link will be introduced. The game is set to release next March, alongside the Switch XL.
>F-Zero NX is in the works, with Bandai Namco assisting in development.
>Star Wolf is set to release in Fall 2021. The game will be very different from the rest of the Star Fox games, as you play as Wolf O'Donnel and his team instead.
>Pikmin 4 is very far into development. Much is unknown about the title, but it will be released next year.
>There will be a Smash Direct on June 15th. Max Brass and Crash Bandicoot will be unveiled.