When enabled, it should throw everything possible down the pipe. Let syslog on the other end sort it out. I would love to 'tail -f /var/log/kickstart' on my syslog server and watch the install progress. This would be really great for headless pxe installs.
You'll get an option to specify your logging level, with the default set to something in the middle. Half the point of reworking the logging support is to make it less verbose so the average user doesn't freak out seeing tons of debugging output fly by and think they have a problem. I guess for you guys who will be enabling network logging support, it'd make sense to assume you won't be confused and crank the default output up a bit. - Chris