I tried the new RC and couldn't get the install/upgrade page to work properly. Since I'm accessing it through HTTPS Chrome's blocking the loading of jQuery from the Google CDN because it's "hard-coded" to use HTTP. I managed to fix this by changing it to //ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js in app/View/Layouts/install.ctp, but there might be more pages where this is a problem.