One thing I loved about PSO2 before I even got a chance to play was that they had Vocaloid concerts (Or maybe it was just one...) . One of my favorite Vocaloid songs "Online Game Addicts Sprechchor" is a song that features Miku Hatsune on the stage, singing for the players.
I really love Vocaloid and going to Miku Expo for the first time (Though it has been delayed now...)
My favorite Vocaloids are Len, Flower, Iroha, and Lily.
I hope to see a Vocaloid concert in PSO2 like in the JP version, I just feel like it fits the theme so well since Vocaloid is all digital !