Not overly concerned here. For original characters, my guess is two shown in Nintendo Directs pre-release (August and October, let's say), one streamed on the Smash site, one shown in a Smash-exclusive Direct, and one shown only post-release. And that's not counting the possibility of characters doubling up in trailers like K. Rool and Dixie, or even unrelated characters who fit together (say Banjo-Kazooie faces off with a new witch in Ashely). Plus echoes, which can go wherever.
I of course would've liked that rumor for a Direct tomorrow to be true, and it was worth paying attention on account of the coincidental reveals (the Pikachu pop, the new Pokémon and Mario Kart info) but it always was going to be a longshot. Whatever, on the bright side, it's helped this month pass more quickly so we're all closer to the next Direct and release.