I'd imagine it's a placeholder for now that'll have more added eventually. They aren't too difficult to produce, considering it's just a bunch of songs stitched together with some transitions, so I can't imagine they'd cut it. Especially considering Blizzard officially uploaded BFA's and Shadowland's as promotional material leading up to their release, with full names and everything (Before the Storm and Through the Roof of the World).
I wouldn't worry until the expansion actually comes out.