A message posted to Square-Enix's official Final Fantasy XIII site on Friday indicates, after not too much work, that some news is forthcoming on Friday.
The news post dated Friday - no link, nothing further - said simply: "A puzzle for FINAL FANTASY XIII fans! Solve this anagram to find out what lies ahead: A Henchmen Inventor Tent Unto. Check back Monday for the answer!"
We can check back on Friday, actually, because a couple users on the finalfantasy-xiii.net forums unscrambled it to say "Announcement Nov Thirteenth." No word if that's to reveal the game's long-awaited North American release date. Guess you'll have to check back then.