– Database Configuration Screen
I found the firstin while going through my initial steps of installation. The table prefix field is now prefilled with a randomly generated alphanumeric string instead of a static ‘jos_’. Random table prefixes help prevent unwanted visitors hacking into your site and retrieving vital username and password information ie your Super Administrator password. Typically hackers use SQL injections to hack into your website from the jos_users table. By simply changing the default prefix to a random string prevents most SQL injections and hacks.
The description says:
Choose a table prefix or use the randomly generated. Ideally, three or four characters long, contain only alphanumeric characters, and MUST end in an underscore.
This is not a huge thing but it is a big plus to me because it is important to security of your database. Of course this is only one of many things you can do to protect and secure your Joomla website.