Greetings!

Soken had commented on this during the Letter from the Producer LIVE Part XXIII:
Q: When will you sell a soundtrack with the music added in Patch 3.0?
A: Yoshida: It might be the death of Soken.

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.
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!