First of all, thank you to @amy for providing a link (see comments below) to the full PV and after watching it, looks like Meisa’s not in it. I guess we’ll have to wait for the movie to make its road show start to see Meisa in her full ballet glory.
Above clip is just a teaser of the whole PV which will hopefully make it on YouTube soon. The title of the song is “Bolero” and it’s sung by the very popular K-pop group Tohoshinki who will be making their Kouhaku Uta Gassen debut this year. “Bolero” will be the theme song to the film “Subaru,” starring Meisa Kuroki, which is based on a popular manga about ballet.