What is Corona?
Corona is the name for the development tree of Aurora. It may help if you are drinking a Corona while you attempt to use the packages in this tree. This is where the developers put packages before a proper tree is ready for release. If you can't wait (or you're helping the developers test), this is where you can find the latest packages.
How to Install Corona
grab the aurora-release and fedora-release-notes packages from the corona repository and yum --exclude=autofs --exclude=hal update should get you there
Note: This procedure should work in theory but at some points in the development process may very well not work at all. Be forewarned.