You can play a few hours of the game’s opening offline, the FAQ answered, but afterwards players are required to connect to the Internet. Square Enix also says the game will have a usage fee, but the price has not been determined.
http://www.siliconera.com/2011/09/06...est-x-offline/

I also speculate that the Wii version will be delayed until the Wii U version comes out. The Wii version will come out a month later.