Square Enix has released a series of Kingdom Hearts recap videos narrated by Chirithy in Japanese today. Nomura has plans to feature these in the Kingdom Hearts game. Also, Square Enix released an official site for the Kingdom Hearts recap videos.
Update (June 25th): You can read the official leaflet in English on the official site page here..
These videos can be helpful to new fans and for fans who needs to be refresh on the Kingdom Hearts story.