It looks like there will be 2 more characters, original or echo fighters.
Yes, I said that because the character list has 2 blank spaces at the end that are just not pretty, but either way, they have to yet properly announce the "mystery" mode they talked about at E3. Probably on a Smash Direct somewhere in November. They will probably announce the very last things there and get the game ready to launch and dissappear in minutes from the stores.
Also, the Nintendo Switch Super Smash Bros Ultimate edition... I'm not going to complain about the dock and Joy-con design, I think the dock looks OK and the Joy-Con design has its haters and its supporters... But the game being digital may just eat the entire Switch memory, considering the stuff that is on the game and how much space Smash for Wii U occupied with all its updates and DLC, and it worries me for all the people who buy this game digitally and realize they need a microSD 32GB and up to have this game downloaded.
And another nitpick I have... The Switch Smash edition launches November 2nd. I can get they want to launch it on November to have it ready on stores for Black Friday, but it's one month of waiting until you can play Smash on your new Smash Switch... Kinda brutal, in my opinion.