In a listing on Amazon today it was revealed that the Halo Wars 2 Original Game Soundtrack is getting a vinyl release. The soundtrack is composed by Gordy Haab, Brian Trifon, and Brian Lee White.
The release will be a 2LP on red marbled vinyl. The artwork appears to be promotional images for the game.
The release is handled by Sumthing Else Music Works is scheduled to release on September 22, 2017. It is priced at $40 and is available to preorder via Amazon here.
Update Oct 6, 2017: The release only comes on red marbled vinyl, and does not include a green disc as originally mentioned.