X-2 HD has been confirmed to be coming with X HD on PS3. You'll get both games for what seems to be 60$. It has also been confirmed that both games will be the International versions, complete with the additional content.
Both games will be coming seperately for the Vita, for 30$ each. It has also been confirmed that the PS3 and Vita versions will have distinct trophy sets.
Square shall have all of my monies. All of it.
edit: for some of you who might be out of the loop, Square recently confirmed that they are not merely porting the game in HD, but are retouching some of the characters. In particular, their faces are quite a bit more detailed and have more polygons to them than their original PS2 counterparts. Here's a video. I suggest you watch it in 720p.