While I can't comment about the requests about a Pharos Sirius mount, Soken recently tweeted out that the music for Pharos Sirius (Hard) is the same as the edited version of the Pharos Sirius track with a new intro part. They decided to keep the original music because it was created with the community during one of the live events in Japan. The entire loop is 12 minutes long! I personally can't wait to run this dungeon and listen to this awesome music!