The background discussion is the "shulk is a phitoshopped little mac" all over again.
The best proof would be to find a printed banner and check how high the level of detail are on those. For printing is very natural to make modifications because of color and ppp reasons (is VERY costly to make really clear images).
I remember in the last event i went there was a big banner and the detail level was like the leak, but I dont remember any specific scenario items to disprove anything.
Im team real btw. Anyone that has worked on printings and stuff knows how does that work. It looking like an accident makes it 99% real or the leaker is terribly good AND stupid and is gonna be sued for this.
In any case, all statements from any media you see from out there saying its fake is 90% damage control. I dont work in the videogame industry, but Ive work in others with big media power and I have seen how easy is just to pull the strings in case something like this happened. Because if its real, is bad for them and their marketing strategy (direct wont be such a big wow). And if its fake, direct will be a HUGE dissapointment. Its a rather steep ordeal for nintendo, this one, because, as I said, for it to be fake it would need such a major level of attention, planing, and stupidness that its impossible to be fake unless you are delusional or you want to keep your expectatives in check.
Seriously guys, someone must know by now thst saying "too good to be true" is not an argument when you have everything there. Is not a text leak, is a ****ing video.