Why would they talk to Sony about an expansion, Sony wouldn't play any part in that. Only reason they would talk to them is if they were planning to repackage FFXI for PS4 release, highly doubtful.
If I had to guess they stumbled on some undated article from before SoA, when they had to negotiate a larger partition on the PS2 HDD since it was still getting PS2 release in Japan.
Otherwise
An expansion *could* happen if SE wanted to, but with the dedication of what remains of XIs playerbase everyone would have heard about it the moment Matsui (Is he still in charge) farted while considering it. There would be an OP full of links followed by a thread of people who had all heard the same thing.