The first two will probably be added in the games as the HD remakes should be based on the International versions. I don't see them as DLC as SE said themselves what the game is made of. The Last Mission and Prologue could be DLC (though kinda stupid as they're not really "new" content).http://www.vgleaks.com/possible-dlc-for-ps3-final-fantasy-xx-2-remakes/
Final Fantasy X International Additions - $4.99
Final Fantasy X-2 International Additions - $4.99
Final Fantasy X-2 Last Mission - $2.99
Note: This is applicable to the PS3 version, the Vita version could be the same.
If true I think it's completely disgusting.