Lucky for you guys my uncle Tony works at Nintendo and managed to take some screenshots for me, so I got these fresh leaks of the character selection screen and some of the tracks and I'll be glad to share with everyone here.
Character selection screen

As you can see the locked characters are rumored to be the 4 guys, some characters such as Aeromatter unfortunately didn't make the cut but hopefuly will be added as DLC.
The Mario Cup confirmed

The Big Tuper Cup

Forum Cup confirmed tracks

The Nutshack Cup
