The release date is set to May 12th, 2016, but the price has yet to be announced.
This release futures audio in English and Japanese. Subtitles are available for numerous other languages. Characters, monsters and environments have been fine-tuned to HD detail and the BGM has been remastered. The Dark Aeons from the International edition of the game are also present. Other features include Steam achievements, auto-save and game boosters like a high-speed mode or no-encounter mode.
With the Steam release of Final Fantasy X/X-2 the only three main-line Final Fantasy games that have yet to hit the platform are Final Fantasy, Final Fantasy II and Final Fantasy XII. It should be only a matter of time until we see those on the PC, as well.
Update: The game does not feature dual audio. The information on Steam's store page is misleading.
Today Square Enix announced the PC and Smartphone release of Final Fantasy IX, a game which was originally launched in 2000 for the PlayStation. The release is scheduled for 2016 in Japan. No information on a Western release exists, but it's safe to assume one will eventually follow considering Final Fantasy IX is the only "numbered" Final Fantasy from the PlayStation era that has yet to see a port to the PC and phones.
The trailer shows improved graphics. Kotaku reports that the new version of Final Fantasy IX will also feature achievements, auto-save, a high-speed mode and other game-boosting features.