Played it at PAX today as well, was awesome and now makes the wait even tougher.
The two new characters they had were Inklings and Ridley.
I was most looking forward to using the Inklings but Ridley was the one I liked more, he’s just an absolute powerhouse with pretty good recovery as well. Inklings are very quick but going to take some getting used to.
They could have brought in Waluigi and made him sort of like the Mario sports/party/kart rep. He could attack using tennis rackets, golf clubs etc. His taunt could have been hitting a Mario party dice block and his final smash could have been hopping into a kart and driving like an idiot all over the stage running people over, or maybe a throwback to Strikers charged where he could jump off screen and then kick flaming balls at random all over the stage.