During this morning's PS Vita streaming presentation, Square Enix came in at the very end to tell us that...well, they're nowhere near done with Final Fantasy X HD, which was announced at TGS 2011. They did show off some character models of Tidus and Yuna in HD, and they looked great during the stream. No gameplay, though.
The whole point of this was to remind us that the game is still in development. Square Enix says that they're hard at work upping the graphic quality for Vita. This game better look amazing after all of this waiting!