Unfortunately the install-wizard doesn't give me an option "what to wipe", so I'm a little afraid it automatically does a full wipe? Anyone already did the update? Was everything wiped?
I installed 3.3 over the top of 3.2RC2 - choosing the same m2sd settings as previously - then once the install had finished I wiped cache and Dalvik cache - then rebooted.
All previously installed apps etc still there (the only thing lost was a Dolphin add-on).