Square Enix announced the release of the Soundtrack Album for the Final Fantasy XV.
The new FFXV Original Soundtrack release on December 21, 2016 in Japan for 3800 Yen + tax (normal version).

You can choose two extra, limited edition version for 5000 Yen + tax and 9074 Yen + tax.
Both of them release with Blu-ray disc but with different extra contents from the game and the recording of the music (behind the scenes).

You can already pre-order it from the Square Enix e-Store and you can listen some sample songs on the official website.