Greetings!
Soken had commented on this during the Letter from the Producer LIVE Part XXIII:
So as mentioned, these are just the first steps to be able to make some of the music available while also working on a disc-based version for a future release!A: Yoshida: It might be the death of Soken.Q: When will you sell a soundtrack with the music added in Patch 3.0?
Soken: Our plan is to first sell it digitally, and once a bit of time passes from that we will release a higher quality version on disc. We’d like to start the digital sales around the time of Tokyo Game Show 2015.