same with the mario kart 8 deluxe trailer - just says copyright 2017 (skip to 1:23min)
I just checked Pokken DX's copyright, and it also says 2017 for the game itself. For the Pokemon copyright as a whole, it specifies 1995-2017, but that doesn't count as that's the copyright for the brand/franchise itself, not the game.
For the game it only mentions 2017 too:
Really people, don't get your hopes up too much.
From what I've researched, there is no proof to point that this might be a new Smash.
Obviously they can't do the "DX" stuff because the copyright for Sm4sh had the console's name in the title (Super Smash Bros for Wii U / Super Smash Bros for 3DS). The fact that the game has no title specified yet might very well be because of this.
And the new logo... Pffff haha this is not even an argument really.
I can tell you the logo for the DX titles is not the same as the originals as well, a simply flames here and there doesn't make it new.
Besides, the logo is not consistent in menus or even in-game.
You can have the same circle-logo of Smash but with different assets put into it, Brawl did this several times, as did Sm4sh.
I'm not trying to sound harsh or be a douche, I'm just pointing out that this could be a port or a Smash 4.5, but not an entirely new game.
I'm just trying to help people be more down to earth and to not get their hopes crushed down the road if it indeed turns up being a port or a polished Sm4sh but for Switch with new stuff thrown in here and there.