Just so I'm clear, this will not run PSN software right? It's not a PSP Go with a built in phone, it's something new. I couldn't play Crimson Gem Saga or Tactics Ogre on it, just whatever getss released for that platform. That was my understanding based on what I saw.
It's still useless in my book, for now. Same with the 3ds. Pointless until something I actually want to play drops on it (Zelda + Master Quest for the win)
Back on topic, what makes this game so great? I haven't seen anything too original about it.
I just think it's a game that does everything or almost everything very well. According to people who know japanese, it has a great story, well-developed world, and great characters, it has an endearing art/graphics style, the music is charming and fantastic, and the gameplay is fun. I've played up to a certain point in the Japanese PC version, and without being able to understand Japanese, I still found it a very fun, enjoyable game. If you like classic JRPGs, then you'll probably enjoy this game.
It also has a cat dictionary
Nyaa: These nails are bothering me.
Nya~~: I'm hungry.
Nyao~~n: (an expression of caution)
Nyaon: I'm tired.
Nyaon?: Who are you?
Nyao-n: Yes, that's right.
Nyao?: What's wrong?
Nya-o: So, we meet again...fleshy thing.
Nya-go: It's been a while. How have you been?
Nya~o: Yes, that's exactly right.
edit: this game also apparently has a manga (and is getting an anime series soonish)
ADMIN EDIT: No links to scanlations, thanks.