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http://www.ff13-europe.com/haeresis/
Currently still just a patent, Final Fantasy Haeresis XIII seems to be yet another computer game but will most likely be for another machine other than the PlayStation 3 and Mobile Phones but I may be wrong.
The word "Haeresis" is a latin word meaning that the story could be related to Final Fantasy X in that it could have to do with a controversial religion. "Heresies" is the English derivation of the word "Haeresis."
Since there is no real evidence other than a patent for the name and a presentation by Square Enix which features six "bubbles", three of which are taken up be already known titles and the other being blank, all we can do is wait and see.
Die haben zurzeit nur den Namen Patentieren lassen!! Mehr Infos gibts noch nicht!!!