http://www.techradar.com/news/far-cry-5-release-date-news-and-rumors

Update: Ubisoft has announced that award-winning film composer, songwriter and music producer, Dan Romer, will be the composer for Far Cry 5. 

In addition to composing the game's score, Romer will also be writing original songs and hymns, all of which will be available on a sold-separately soundtrack sold closer to the game's release.