Keep in mind I never thought there would be a reveal at the FE concert. I was just unsure why they would announce that he was going to be there two months in advance.
They announced other game directors and designers. Last time I checked (a month ago), they were even still keeping some of the guests secret. Sakurai was only hyped by the Smash community.
As for the part about the concert.....considering that Roy's been revealed and released, I'd like to think that anyone who believed we'd get Smash info at the Fire Emblem concert have moved on.
Unless they think we're gonna get a sixth Fire Emblem character. Which I'm hoping is not the case, because it's the last series that needs more playable character representation at this point.
Oh god, I hope so. I've seen so many conspiracy theories in the last week that it makes my head hurt.
Here's some that I've seen:
Nintendo released the patch early so they could hype the release!
RandomTalkingBush or crediar are in cahoots with Nintendo
Roy would be announced at a FE concert in Japan
Ryu and Roy wouldn't be released right away even though they were finished.
Sakurai will cancel the update because of datamining. (I think some of these posters were serious)
Some guy on reddit tried telling me that RTB and crediar datamined the update directly from the Wii U. When I tried explaining it to him, he just linked me to the Smash Wiki and said I was wrong. I just gave up arguing with him at that point.