Many thanks to @FilmEksis for tweeting the links to many video clips at Trailer Addict from the premiere. The clips provide the complete coverage of the premiere before the actual screening.
47 Ronin: Premiere: Japan Premiere B-Roll 1 starts the introduction of the director Carl RInsch and cast members. Clip is here.
47 Ronin: Japan Premiere B-Roll II starts with the arrival of Keanu Reeves and covers his walk down the red carpet as well as others as they make their way to the stage. Clip is here.
47 Ronin: Japan Premiere – Keanu Reeves’ interview is here.
47 Ronin: Japan Premiere – Carl Rinsch’s interview is here.
47 Ronin: Japan Premiere – Hiroyuki Sanada’s interview is here.
47 Ronin: Japan Premiere – Tadanobu Asano’s interview is here.
47 Ronin: Japan Premiere – Togo Igawa’s interview is here.
47 Ronin: Japan Premiere – Jin Akanishi’s interview is here.
47 Ronin: Japan Premiere – Rinko Kikuchi’s interview is here.
47 Ronin: Japan Premiere – Ko Shibasaki’s interview is here.
Note: Coming Soon is starting to load the clips on youtube. You can go here and look for them in the recent upload section.