I hope Persona 5 doesn't do the randomized dungeon layout. From what we've seen it looks like they're getting rid of that but I can't say for sure. We only see bits and pieces of the gameplay at a time.
I hope they don't have random dungeons either. Since they are adding new stealth and platformer bits, I don't think it will be entirely randomly generated if it is. Either way, it's a day-one buy for me.
I've never really been a day-one type unless I preorder and I only preorder when there's goodies to be had. Otherwise I have plenty of games to play. I don't really need to play anything as soon as they come out.