The HD revamp of Final Fantasy X-2 looks quite nice in high-definition. However, looks aren't everything! It's what's inside that counts.
And what's inside Final Fantasy X-2 HD? According to Famitsu (via Yahoo! News), it's currently "undecided" whether or not "Last Mission", which featured in the game's international version, will appear in the HD remaster.
As the Final Fantasy X-2 wikia explains, the Japan-only Last Mission version has added content set three months after Vegnagun's defeat and lets players explore Yadonoki Tower, a dungeon that's only available in Final Fantasy X-2 International + Last Mission.
If Square Enix is going to remaster FFX-2, why not add Last Mission too?
HDにリマスターされた『ファイナルファンタジーX-2』の美しさをチェック！ [Yahoo! Japan]