I know it's a 4chan leak but I find it funny because it mentions a Tetris stage. It was posted before the Smash tweet about the new spirits, it's from a few days ago:
http://boards.4channel.org/v/thread/481496694/nintendo-direct-on-november-13th-will-focus
The text:
>Nintendo Direct on November 13th. Will focus primarily on Pokémon Sword & Shield, Animal Crossing: New Horizons, and Super Smash Bros Ultimate.
>Starts with a beach with a TNT crate. Reveals Crash Bandicoot as the final fighter of the Fighters Pass, releasing in December. Terry is showcased for a bit, and will be released later that day for Smash Bros. Mii costumes are shown (Geese Howard [Fatal Fury], Haohmaru [Samurai Shodown], Marco Rossi [Metal Slug], Byleth [Fire Emblem: Three Houses], and Akira [Astral Chain]). A Minecraft stage is shown with blocks that you can attack, which will break them into smaller items that you can pick up. You can throw these and the block will place where it lands. A Creeper comes in and destroys a large portion of the stage. It's announced that a Minecraft DLC will be released in December for $4.99, which will include the stage, a Creeper assist trophy, music, and a Mii Costume. Fighters Pass 2 is announced available to purchase later that day at the same price as the first one, and this will be the final set of DLC for Smash Ultimate. Purchasing Fighters Pass 2 gives you a Tetris stage. Smash section ends with the screen getting slashed and an image of a katana sticking in the ground, hinting at, but not showing or revealing, Ryu Hayabusa.
>Pokémon section starts by revealing the final evolutions for the starter Pokémon. Scorbunny evolves into a humanoid rabbit with a soccer ball. Sobble evolves into a humanoid chameleon spy. Grookey evolves into a large gorilla with a giant drum. A new ghost/water ghost-ship and a fire/grass goat with a pan flute are announced as version exclusive Pokémon. The Pokémon section ends with a space-dolphin being revealed as a legendary, although the type is unknown.
>Animal Crossing starts by focusing on all of the villagers, revealing that every villager from every Animal Crossing will be in the game. Talks about crafting and multiplayer for a bit as well as new amiibo cards that allow you to bring that villager to your town to visit with an exclusive gift, and you can try to convince them to move in. You can expand not only your house, but also your entire town. The final town upgrade allows you to have up to 24 villagers in your city.
It's probably nothing because it has too many details. But when I saw the Tetris spirits I thought about this 4chan post.