These are just some rumors that i found regarding the game but still its pretty exciting to read this stuff



quoted from:
Final Fantasy X HD

•Re-created for new engine characters, aeons and some stage elements.

•Cut scenes and FMV will be enhanced with some "filter" of FFXIII engine — probably, it's some kind of AA-filtering and smoothing.

•Magic, special effects and lightning will be re-created using new engine called "Luminous".

•Blitzball game will take little changes.

•FFX HD may have additional network features ( in the light of previous item — I can predict that game will receive multiplayer for Blitzball game in some form, and maybe something else ).

•Release Date — in 2012 fiscal year ( i.e. before 31 March, 2013 ). At the moment it's impossible to concretize release date, but I personally can expect FFX HD to be released in Japan somewhere in Summer / Autumn of 2012. Actual release date highly depends on scale of planned new features ( how many resources required to implement all of them ) and how long FFX HD is in development stage for now. But, if take into account that there is no any pictures of game or official details — highly possible that FFX HD development started not very long ago.
this is all really good stuff and i hope 31 March 2013 really is the latest we have to wait for this gem.