Bravely Default demo out July 28 in Japan, which will let 3DS owners play chapters 1-4 of the Square Enix game without spending a single yen. So that's something like 30 hours at least of high-quality, old-school JRPG action for free. That, Square Enix, is some demo.
Of course, you don't get that kind of offer without a catch, but it's only the exclusion of voice acting. Japanese audio is added back in with a 2,000 yen download (around $19.62 converted), which also adds the rest of the game with saves carried over. A multilingual alternative with English audio will be available starting August 7, priced 2,500 yen ($24.52.)