Being pre-emptive here (since we’ve had one already)… don’t ask systems about upgrades to OS X 10.9 yet. We don’t have any answers. It was just announced, including the revolutionary pricing of “free”.
If you install it on your own, godspeed to you. Your support is the Apple Store genius bar. We’ll make an announcement to the list when we’ve had a chance to play with it and see what it breaks.