All the config, commands, permissions, and the language system have changed. New options were added, and others were removed.
A new action bar state was added with emojis to simulate new bars. You can customize it or even disable it.
The drinks are now fully customizable.
The sleep feature was removed since Spigot implemented sleep checks in version 1.16. By default, all survival and non-AFK players must sleep to pass the night.
New drinks and other options related to thirst are coming, including a new state of alcoholism.