Stevey Great find.
There is room for 36 characters for those two rows....if they are completely filled.
So it looks like the roster will be either 35 or 36.
We also have a good idea then what the roster will be. But, there could be a nice surprise with the 36 character.
So lets see what it looks like with speculated characters.
That list shows the unlocks of:
Luigi, Marth, Mr. Game & Watch, Captain Falcon, NESS
Who we know is also in the game is:
Ganondorf, Sonic, Snake, Peach, Zelda, Kirby, Meta Knight, Yoshi, Jigglypuff, Lucario, ROB,
That looks like there is 5 or 6 more unlockable characters. I personally do not believe Wolf is a character, it makes no sense. I do believe Mewtwo will still be in the game. So that leaves some surprises possibly.