macOS 10.13
iTunes 12.8 Available
Apple has released iTunes 12.8 (build 12.8.0.150). Other than initial support for AirPlay 2, I haven't encountered any other significant changes. (ICYDK, the betas of macOS 10.14 install iTunes 12.9.)
Apple also released macOS 10.13.6 with AirPlay 2 support among the changes.
iTunes 12.7.2 Available
Apple has released iTunes 12.7.2 (build 12.7.2.58). I'm not aware of specific fixes or features. They've also posted macOS 10.13.2, which seems to resolve the problem with displaying album artwork as the file icon for audio files.