Nintendo and HAL just revealed an official Kirby Star Allies soundtrack that's coming out on February 14, 2019.
More info here:
https://www.hallab.co.jp/products/201801/

Bumping the thread... For a Kirby Soundtrack to have six discs, it's astonishing!
Only Planet Robobot had two discs, and Return to Dreamland, Triple Deluxe, and Super Star Ultra had sound selections...

Looking at the track last, a lot of it is just the music they copy-pasted in from other games, which HAL was particularly egregious with this time around. That said, the original stuff's great, especially the DLC tracks, so I'm hoping someone got a hold of this.