Japanese blog 'Akiba Blog' has taken some photos of the stores in Akihabara set up with FF13 decorations. I was in Japan for the release of Pokemon Diamond/Pearl, so I managed to witness (and participate in) one of these 'major game launches' myself. Take a look at them through the 'Source' link below. Be warned about clicking around too much on the site though, there may be some NSFW things.
Source: Akiba Blog