With the Japanese release only days away, Ruliweb has been gracious enough to post a recording of the playable demo at the Korea "Play the Playstation" event. The demo features a few playable moments on Destiny Islands, including the race with Riku and battles with Tidus, Wakka and Selphie.
Credit to Libregkd for the news link. The footage has been uploaded to the KHV Youtube channel.
New Demo footage released from Kingdom Hearts 1.5 HD ReMix