I assure you that if we finally get a Real True Reveal of Persona 5 on February 5th, Famitsu will already have the press materials Atlus sent them ready to go. But I guess they might hold off until the week after.
Ooh or maybe we'll get a little something a week before the concert that basically functions as an advertisement to go see the concert.
Sure, but I think the week after is likelier because it'd be pretty weak if their stuff leaked before the event, and Atlus seems to be pretty savvy about that from how they've shown off info so far (and that's assuming a plethora of content will even be shown at PSL itself, and not through something else happening along with it). It was on a Sunday, but there wasn't anything new from Famitsu, content-wise, the week following the November 24, 2013 event (or the week preceding it).
I guess a promo could work, but I don't see the point of it acting like an advertisement a week before the concert when tickets will most likely have already been sold out. Like pan-hime suggested earlier, they could announce a live stream for PSL a week prior to it.
What I expect regarding PSL before the event happens on February 5th is the following: updates showing off the logo, discussing merchandise that can be bought there (like Persora 2 and the Persona 3 The Movie #3 CD set) and potentially announcing a live stream for the event.