Thanks Pattie. I did install the beta, and have since uninstalled it waitng for the Sunday release of CS6. What I noticed after installing the beta is that CS5 was not touched during the install process so I was curious if CS5 would be overwritten, or left intack during the upgrade of the official CS6 upgrade.
Both versions (Cs5 and CS6) can co-exist on the machine, and will be separately launchable (and even at the same time since you are on a MAC).
The CS6 install won't be touching the CS5 files or overwriting them.