Databricks platform release notes cover the features that we develop for the Databricks Data Science & Engineering workspace and Databricks Machine Learning environment.
Databricks runtime release notes cover the features that we develop for Databricks cluster runtimes (or images). This includes proprietary features and optimizations.
Release notes for other Databricks tools:
Preview releases come in various maturity levels, defined in this article:
For Databricks SQL release notes, see Databricks SQL release notes.