MySQL 8.0.28 version is GA!!! , ready to use in production.Below is high level overview , more can be viewed from the weblink.
 Disabling Audit Logging for all connecting and connected sessions
audit_log_disableto true disables the audit log plugin. The plugin is re-enabled when
audit_log_disableis set back to
false, which is the default setting.
- [Under Performance Schema] A new statement metric, CPU_TIME, is now available, enabling you to measure the CPU time spent on a query.
ALGORITHM=INSTANTonly modify metadata in the data dictionary. No exclusive metadata locks are taken on the table during preparation and execution phases of the operation, and table data is unaffected, making the operations instantaneous. If not specified explicitly,
ALGORITHM=INSTANTis used by default by DDL operations that support it.
PAD_CHAR_TO_FULL_LENGTHSQL mode was enabled on a replica server, trailing spaces could be added to a replication channel’s name in the replication metadata repository tables, resulting in errors in replication operations that identified the channel using that data. The issue has now been fixed in MySQL 8.0 by using VARCHAR for character columns, and in MySQL 5.7 by disabling the SQL mode when reading from those tables. Thanks to Brian Yue for the contribution. (Bug #33213841)