Totaldemon on 06 November 2012
It seems that you can just put the disc and play all the games you want without any online configuration, but in order to have acces to the wii u online features and apps right after connecting your Wii U system to the internet for first time it will need to download a patch (somehow a big patch a guess) that will add MiiVerse, NintendoTVii, Wii U Chat and the eShop to the system.
http://www.ign.com/articles/2012/11/06/wii-u-will-have-day-one-update
