I know I'm late to comment on the new trailer (which is particularly bad considering that I watched it during the stream ;>_>), but I want to say that I'm impressed at how Atlus manages to one-up itself with each trailer. There's so many things about this trailer I want to talk about but for the sake of brevity I'm going to slim it down to what I liked the most; the new characters.
Punchy/Biker-chan is probably my favourite of the three because I think her normal design and her Phantom Thief design compliment each-other really well. I initially thought she was going to be an antagonist for some reason, and her raw anger certainly maker her look threatening even though she's your ally. She seems like a really intense character and I feel like this group needs someone who takes this Phantom Thief business seriously at all times.
Having her Persona be a motorcycle is clever because it really highlights how Atlus is approaching this game from different angles and not just resting on P3/P4's winning formula. Also because motorcycles are rad and that she should challenge Mitsuru to a drag race in the inevitable P5 Arena.
Hacker/Sakura Futaba is probably my least favourite of the three, she looks like fanart of another character done is Soejima's style that a character Soejima actually designed. Her face in particular looks really off when she doesn't have her headphones. Her casual outfit is perfectly fine and I enjoy her Phantom Thief outfit, even if I think her mask is really dumb looking.
The funny thing is, I was thinking the day before that having a hikkikomori act as the Navigator would make sense for what Persona 5 is going for, and lo and behold Atlus does exactly what I wanted.
I do think that the smirk she does when activating her abilities is interesting because it hints that she's applying her online persona (hurr, hurr) to her role as a Phantom Thief and I'm interested to see how that plays out.
As for "Beautiful Thief", it's kind of amazing that Atlus can reveal a character, say almost nothing about them and still have people like them. I wasn't sold on her initially because I didn't think she had the 'edge' necessary to fit in. By edge, I don't mean to say that the other characters are 'edgy', that they're trying way too hard to be cool or taken seriously (though I totally understand if someone else thinks this way.) When I mean edge, I'm talking about the innate drive that gives the characters the motivation to actively act on their grudges against society rather than just wallowing in their own frustrations. Beautiful Thief doesn't appear to have that on first glance, she seems caught up in the romantic ideal of being a Phantom Thief instead of being invested in the reality of that life.
And then 'Adieu' happened and that single screen sold me on her character. Yes I'm shallow like that. If I had to give a reason, it's because her portrait art shows her having that edge in the way she looks at the viewer while drinking tea and the demons die behind her. It's still unclear what her motivation for joining with the Phantom Thieves is, but I'm confident that she has as legitimate a bone to pick as the rest of them.
I still think her casual design, from what little we can see from the trailer and the boxart, doesn't look great but her Phantom Thief design is aces all the way through.
Considering how conservative Atlus has been with showing off new characters, the fact that they've decided to go "Summon all the ̶w̶a̶i̶f̶u̶s̶ female cast members" is the biggest sign that they're definitely ready to release this game for real.