Saw this posted up over on Neoempire's forums by Kaworu, seems like over on Versuscity they believe there will be an update to KOFXIII. Doesn't specify what exactly is being updated or the original source of information though.
I'm not sure if it was the same site or not, but i do remember some time ago hearing about a KOFXII update which never happened so don't get your hopes up yet.
Hopefully they'll bring out the console version soon and none of this will matter.
Read the original post here.
Anyway new Arcadia has shipped, should hopefully have that next week.
Not too sure whether there is any KOFXIII related things this month, but i'll do the usual write up if there is.