Update: The official European website for Kingdom Hearts 3D has been updated with the trailer available via one of the four banners on the home page. It also now says "Buy Now!" instead of "Pre-Order!" with the game now available in Europe.
Square Enix Europe have released a Launch Trailer for Kingdom Hearts 3D [Dream Drop Distance], which released in Europe on July 20, 2012 (with a North American release on July 31, 2012). The Launch Trailer contains new English footage of the game, including both gameplay and cutscenes. It's in HD 720p and quite impressive, so please check it out! You can watch it below, or download it from our video archive.
Square Enix Europe have also uploaded a short message from Shinji Hashimoto (the producer of the game) and Yoko Shimomura (the composer of the game) from Japan Expo 2012. You can see this below.