Square Enix have just launched a new microsite in the run-up to the 35th anniversary of the original Final Fantasy's launch in Japan, which will be on December 18th of this year. It's quite limited in content so far, though they did publish the site for both English-speaking and Japanese audiences. So far, it mainly has a message from Yoshinori Kitase and links to a couple Final Fantasy-adjacent games coming soon, Chocobo GP and Stranger of Paradise.
With nine months left until the actual anniversary date, the site promises more to come so there's a wide variety of things that could show up. Possibly even more Final Fantasy XVI news?
Source:
Final Fantasy 35th Anniversary Special Site (English)