Those screenshots look very nice, they've got me excited. Hopefully Luigi plays more of a role in Paper Mario 2 than he did in Paper Mario, he's in a few of the screens, but they're all in his house... i wonder if he leaves the house in this one, i hope he does. It appears Toadsworth is in the game, he's becoming more and more "popular", i like him.
I absolutely love the graphical style, and i'm glad they're sticking with the 2D paper look. The paper plane thing sounds like a really cool idea, how could someone not say "cool!" when you tell them that Mario can fold into a paper plane? This game looks really fun, i can't wait to play it. I hope to see some of that trademark humor that's present in all the Mario RPG games too.
I hope that somehow we get the original Paper Mario as a bonus disk or something, because i've played it (by renting it a million times), but because only a limited number of copies were released here i could never buy myself a copy, and i would love to own the game. I doubt it... but it's possible!