We first heard about Napster Japan itself when it was announced last fall in a partnership with Tower Records, but it looks like we now have a few more details on the service and a rough launch date.
It's now set to launch sometime this fall and it'll be a flat rate service, although exactly what that rate will be has yet to be decided.
The service itself will apparently be the same as in the U.S., with both basic Napster as well as Napster To Go for transferring music to portable devices.
