Hello everyone! This is my first post. I created an account just to share this with you all.
There's a post floating around on Reddit right now about the colors of the chairs behind Mr. Sakurai and how they pertain to Waluigi being hinted at. After today's direct, however, I have a different theory.
As much of you are mentioning:
1. Rambling Evil Mushroom took one of Skull Kid's AT functions.
2. The new Moon AT appears, really suspiciously, without Skull Kid.
3. Skull Kid's trophy is still nowhere to be seen. We saw a similar situation with Dark Samus.
4. A few LoZ tracks were accounted for, but missing from the music list Sakurai demonstrated today. Three tracks, to be exact:
https://imgur.com/6XB4b9L
5. Finally, the colors of the furniture behind Sakurai matches Skull Kid's palette (green, yellow, purple, red, brown), not Waluigi's:
https://imgur.com/S7JjKSK
This isn't 100% confirmation. But the coincidences are certainly compelling.