Not a day after I was demoing SCOM 2012 Beta, do Microsoft go and release the RC!
You can find the download here:
Couple of things of note from the Release Notes:
Install hotfix before installing the Operations console
Before you install the Operations console, install the hotfix from article 976898 (http://go.microsoft.com/fwlink/?LinkID=194637) in the Microsoft Knowledge Base. You have to contact Microsoft Customer Support Services to request the hotfix download. This hotfix helps prevent performance problems with the Operations console. After you install the hotfix, you must restart the computer.
This hotfix might not be required for all servers. The Operations console prerequisite checker checks for this prerequisite and alerts the user if it is not there. The hotfix has to be installed if the prerequisite checker finds that the hotfix is missing.
Upgrading from System Center 2012 – Operations Manager Beta to Release Candidate is not supported for installations upgraded from System Center Operations Manager 2007 R2. You can upgrade from System Center 2012 – Operations Manager Beta to Release Candidate but only if the Beta installation was a new installation. You cannot perform the upgrade if the Beta installation was upgraded from System Center Operations Manager 2007 R2.
There is a ton of information in the release notes, so please read thoroughly before installing to know what to expect.