Sega has revealed some of the items they intend to have available at this year's Tokyo Game Show. There's a full list available on their site. What might be of interest to folks here is the "Phantasy Star Series 25th Anniversary Sound Collection" item. A picture of it is available at the aforementioned link.
There's no word on what music is included on this collection. There's a picture of Myau and a classic style logo on the cover, so it probably has some of the original series music. I'd expect something from Phantasy Star Online or Online 2 maybe, since they'll be showing Online 2 at TGS as well.