Square Enix is celebrating Final Fantasy's 25th anniversary this year. Leading off the festivities, the publisher has opened a teaser 25th Anniversary portal site.
The site currently just has links to all the numbered Final Fantasy games, and to Theatrhythm Final Fantasy and Final Fantasy Brigade. There's also a link to information about a 25th anniversary concert that will be held in London on November 2. See this page for details on the concert.