The Tech Report informs us that Epic Games' Epic Citadel tech demo is now available to the general public, you can test it over here. To be able to run it, you need Flash Player 11.2 RC.
You'll need the Flash Player 11.2 Release Candidate to run this thing. I gave it a shot in Firefox myself, since using a pre-release build of Flash is a little awkward in Chrome. (You've got to go into the options, open up "Content settings," and then disable the integrated Flash Player under "Disable individual plug-ins.")