[Zhane Masaki]

The platforms other than PSP are for PSO2, which is confirmed as beign released on Windows PC, Apple iOS (iPhone and iPad, possibly Macbooks too), Google Android phones and PlayStation Vita.

The theme song "The whole new world" is most likely a remix of the song of the same name from the first PSO (a fitting tribute if you ask me, being 10 years since the original PSO came out). I'm sure that if SEGA follows up with its soundtracks we will see a PSO2 OST.

As for the composer, Hideaki Kobayashi has been the main series composer for Phantasy Star Universe and its spinoffs. Heck, he's been the Phantasy Star main series composer since PSO itself. So it would be no surprise he would have done some of the pieces. Kumatani and Tokoi have also been around since PSO and they could well have had a hand in this OST as well.