The thing is, even if new songs are unlocks, and even if quintet versions of existing songs are unlocks, it doesn't change the fact that, if this is indeed true, a vast majority of the most major new content are unlocks. You don't start the game with them, you don't get to enjoy them right from the get go. And that... means that you're doing the same old in a new(ish) system, rather than new stuff in a new system, for your very first Im@s2 experience. I mean, this doesn't make any sense. Your first playthrough is supposed to be something to be experienced. In fact, for many people, it is their experience. You don't hide your new stuff, not like this.
When I think about the new that I've seen, I mostly think about auditions and festas. Lessons are just mini-games, commus seem the same as ever (this time with more foreigner hate! ^^), the major part of the game-part is focused on that. It's nice they got multiple types of performances, though doing it with old songs and old dances when this is supposed to be a full-blown sequel... makes me kinda wonder the effort they're putting into this game.
The only thing I can really think of, though... is that new songs might be plot twists like in DS. In DS, I did find the unlocks acceptable, mainly because the unlock itself was meant to be an experience - a pivotal moment that defined the scenario. If they're handled like that, it's cool, it's just... I knew there'd be unlocks through scenarios in DS before I played it. Here, I'm not even sure if we're seeing most of everything or not.
Though in the end... I'll have to wait for the game to come out to formulate the opinions that matter, but I'm getting more and more worried...