I'd imagine third party players will still work fine, although I can't confirm. Audiobooks are still in iTunes on the Mac"Other minor changes in iOS 8.4 include the relocation of audiobooks from the Music app to the iBooks app"
Rather major I would think for those of us who use audiobooks, but not iTunes music.
Anyone know if this breaks third-party audiobook players?
Do audiobooks still reside within iTunes on the Mac?