Sakurai himself said he wants everything to be a surprise and not spoiled. So tell him that.
Sakurai, the guy who is explicitly planning to reveal every character & stage before launch, leaving no surprises to be had? And to be frank I think Sakurai's response to cutscene being leaked / 'spoiled' online was a bit ridiculous.
We are going to learn about the contents of this direct at one point or another. The direct isn't this holy grail of delivering said information