Content previously not released in the US
The perpetually not-here-yet Final Fantasy X and X-2 HD finally have a Japanese release date of December 26, along with a variety of buying options (bundled on PS3/Vita or separate on just the Vita). Meanwhile, we patiently wait.
We do know, according to Anime News Network, these remasters will include some content from the games' International Editions that is likely new to most of us. Final Fantasy X: Eien no Nagi-setsu, or Eternal Calm, is a 14 minute video set between Final Fantasy X and X-2. It's been remastered and will be included in the package. Last Mission, which includes two new dress spheres, an additional mission and the ability to capture monsters and characters from Final Fantasy X, will also be included.
Final Fantasy X/X-2 HD Confirmed With Eternal Calm, Last Mission [Anime News Network]