From what I understand, the five characters considered the most because of recent appearances likely are Captain Toad, Dixie Kong, Decidueye, Spring Man, and Rex and Pyra, correct?
I’m going out in a limb and say most of these won’t be on the roster. I’m seeing a repeat of last game where use applied Brawl’s selection process to argue that K. Rool, Ridley, Mewtwo, and Mega Man were shoe-ins (which I was guilty of) and only one got in the base roster while the other became DLC. Likewise, the five I mentioned above are considered obvious but all of these could hypothetically not get in for good reasons. I think we’ll see Rex and Pyra on the base roster with Spring Man as DLC but the other three would genuinely surprise me.