I might be late to this.
How many newcomers we sweaty boys and girls thinking we will be getting?
I honestly only see 10 newcomers to be getting in, excluding veterans. Mainly for two reasons:
1. The roster is getting very large, which will be difficult to balance or even implement on its own.
2. There aren’t really any Nintendo characters left to add.
I know that people are going to say that we have already started reaching into the bottom of the barrel by Smash 4, but I believe that we NOW started reaching really deep into bottom of the barrel. The only newcomers that most will interest the casual audience or make the most sense are:
Inklings (Confirmed)
A New Xenoblade Character
ARMS Character
Gen 7 Pokemon
Any Popular Ballot Character
But thats really it. Most other characters that I have seen mentioned here are either obsure that the most people dont even know, or characters people wont care, want, or would even backlash against Nintendo for including them. IMO unlike Smash 4 which had a lot of characters I was hyped for the newcomers that were added in like Megaman, Pacman, Palutena, Greninja, and even WFT and Duck Hunt. This might be the Smash game with the most underwhelming newcomers aside from the five I mentioned above.
EDIT: This is just my opinion, so I just wanted to share my thoughts. Let me know your thoughts if you disagree.