49 is still a ridiculously large roster for a fighting game. Of course, I still want more, but I'm also far more impressed by the newcomers here than in Brawl. Sakurai also went back and fixed Zero Suit Samus as well as attempted to make Bowser more than a for-shits-and-giggles character.
If we're still going with the Gamatsu leak even after Chrom was (literally) kicked to the ground, I would like to see at least 53 total characters because I think the Zelda series should get a legitimate newcomer. Toon Link (justifiably) replaced Young Link, but they didn't take advantage of what makes him unique from regular Link. Also, I'm not entirely convinced that Snake doesn't return. We're dealing with two of the biggest trolls in the industry. Sakurai has been silent on the subject of Snake and Kojima says he's not involved. Does he have to? More importantly, can we trust him?
By my count, take Brawl's roster minus Ivysaur and Squirtle, that's 37. Plus Mewtwo (just having some fun), that's 38. So far, Wii U/3DS have 11 newcomers (or 13 if Mii Fighter get a separate box for each type), that's 49. If there are more newcomers left, additional spots are needed and four more newcomers isn't too hard to imagine. This is also assuming the game has an even grid as Melee did not.
Something to keep in mind: Melee had 14 newcomers, Brawl had 18 newcomers. If Wii U/3DS only gets two more newcomers, that will be the fewest amount of additions in the series. I understand that the larger the roster the more difficult balancing becomes. I'm just mentioning this for discussion's sake. I wonder how many more newcomers Sakurai could reasonably include.