Update: http://rpgland.com/final-fantasy-xiii/is-this-the-final-fantasy-xiii-north-american-box-art/ has now uncovered what appears to be a preliminary picture (below) of the Final Fantasy XIII North American PS3 box art on http://www.play-asia.com/paOS-13-71-bp-77-1-49-en-15-%22Final+Fantasy+XIII%22-70-2wbj.html.
Square Enix have posted an anagram on their official North American Final Fantasy XIII http://na.square-enix.com/ff13/ recently. The puzzle, dubbed "A Henchmen Inventor Tent Unto," appears to hint at an upcoming Final Fantasy XIII announcement.
Shortly following its release, http://finalfantasy-xiii.net/2009/11/07/ffxiii-anagram-solved-announcement-nov-thirteenth.html uncovered the message's meaning as: "Announcement Nov Thirteenth."
To quote: "The nature of this 'announcement' is still up in the air, though our money's on an official North American release date for the super-anticipated RPG.
Though, considering the speed at which the series is growing now, we wouldn't be surprised if Squeenix went ahead and dropped the Final Fantasy XV bomb on us."
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