There's a great interview and an impressions article on the Wii U game up on Nintendo Life now. Game's looking fantastic. Hopefully we'll see some more coverage on the 3DS game soon too, and how its length stacks up - the main story alone is said to be around 40-50 hours in the Wii U game, though they constantly tempt you with other things to pursue instead, there's so much to do in the game.
http://www.animedream.com ~ Anime Dream - We're like your RPGFan buddies, only anime-based! ~ Tsukasa