All we know is that it's coming out in autumn 2014. They're obviously pacing themselves in terms of information because of all of the games they've got going on.
Evidently, PQ is the current focus because that's the game that's coming out the soonest and was the only game out of the four announced at the event to have an actual release date. After that, or somewhat concurrently, P4A2 will probably have most of the info coming out. Then P4D and P5.
It'd be funny if they each had a specific day of the week for updates, though. PQ is always Friday and P4U2 has been mostly Thursdays thus far.
Also, for some reason when they announced #Re:birth I had got it in my head that the new Persona magazine was going to be monthly, but that's obviously not the case.