Loyal Tales Fans will be rewarded in Tales of Xillia 2

[Andromeda]

Namco Bandai has announced in addition to bring Tales of Xillia 2 over to the US and EU regions, that there will be bonus DLC available specifically to those who have played their other Tales games on the PS3. In order to get the DLC, you will need to have save data from both Tales of Graces f and the upcoming Tales of Xillia, when Tales of Xillia 2 comes out. The DLC that will be unlocked is not stated, but the Tales games on the PS3 have been known to have a large amount of DLC. So there are a lot to pick from.

Source: Tales of Xillia 2 Will Have Bonus Items For Loyal Tales Fans - Siliconera

[Taicho13]

You get attachments depending on the games you've beaten. Having a Graces f save will get you a Sophie doll attachment. Having an Xillia save file will get you a Jude or Millia doll attachment, or both, if you've finished both sides of the story. These should both unlock in-game instead of getting them off PSN.

There was also a Yuri doll attachment for the Vesperia PS3 save but they will probably cut that out since it's doubtful that the Japanese save will unlock it in an English Xillia 2. They may offer it as free DLC from the PSN.