I recently upgraded MySQL to the DMR release of 5.6.3. Available here :http://dev.mysql.com/downloads/mysql/5.6.html#downloads
I was reminded of a some questions about mysql_upgrade I have gotten lately. While it is easy to skip, do not forget to run
/usr/bin/mysql_upgrade after you upgrade.
Yes it is typical to see clean tables.
I do not want to repeat what others have said so more on mysql_upgrade can be found by these community posts if needed: