But it's not like P Studio unveiled anything concerning their game reveals the week before an event the last time there was a significant countdown, despite the fact that the event took place on a Sunday. I don't see why this time would be any different.
The thing is, as you pointed out earlier, this obviously isn't like other times; As of yet, they obviously haven't revealed anything about the music of visuals of P5(aside from the 1st/2nd trailer), yet they are obviously putting up a pretty big signal that some P5-related is going down at the Concert. I wanted to ask something as well, for the last several times where they showed a visual for the concerts, old or not, were the concerts even announced or advertised to feature stuff from those sources, like P3P, Persona 4 Golden, P3: Movie? It would be natural to play previously revealed videos and a song from a month or two ago at an upcoming concert, especially when the concert wasn't touted to reveal anything big.
Where I'm going with this is, we didn't get anything first, so the just increases the chances of getting something new at the concert that much better; the last 2 trailers for Persona 5 we've gotten have only majorly consisted of sound effects. If they're gonna play the intro song or battle music(I'm putting my money in the opening myself; only reveals as much as they want to and works better aesthetically compared to gameplay footage), I'm gonna bet they'll have something visual up for everybody to see.
Which brings me to another point; the venue. Now, I'll admit, I haven't been to a concert before, and don't know what it's like inside one. But, considering that 1).this is one of Japan's biggest theaters, holding over 14,000 people, 2). It was obviously designed to carry sound a great distance over the crowd and 3).the fact they have screens facing all 4 directions of view for the audience, I really don't think revealing a music video would be impossible there.
Here's a picture for posterity's sake:
So, I don't know if I'm just being optimistic or not (or maybe, un-optimistic, since I don't expect anything to be revealed before Feb. 5th), but I'm definitely putting my hat in the "Something cool will be shown at PSL -Night of the Phantom-" pile.
My other, more unsubstantiated and hopeful guesses is that once they've sold out on tickets, or once it gets closer to February, they'll reveal that the chained up option on the Persona Super Live page is a livestream or possibly just a link to the visual they show after it's shown at the concert.