The documentation doesn’t really same much about promotional releases. The most I can find is a sentence on the release documentation:
A give-away release or a release intended to promote an upcoming official release (e.g. pre-release versions, releases included with a magazine, versions supplied to radio DJs for air-play).
I wanted some wider input on whether some soundtracks included as part of the special edition of a video game count as an official or a promotional release. I argue that if it is included as part of a particular edition and included in the box (and the price of the box) then it should be official.
Relevant ongoing discussions:
Re-listed edits for a clearer discussion: