Found this on playstationlifestyle. It is a Gamestop weekly ad where it says you can have a “Free Limited Edition Upgrade” when you pre-order the Final Fantasy X/X-2 HD Remaster.
http://www.gamestop.com/gs/weeklyad/current/062613/olfsi_062613-2.aspx
Apparently there is going to be added content available on a supposedly limited edition of FF X/X-2 HD.
Perhaps an artwork book and soundtrack .if they want to go big it might also be small models of the characters.
we will have to wait for more info.