SCOM 2012 is just generally available and the first CU1 has already arrived.
You can download it here: http://www.microsoft.com/en-us/download/details.aspx?id=29697
For a full list of the improvements check the official KB: http://support.microsoft.com/kb/2686249/en-us
For the install experience check this blog post of Kevin Greene: http://kevingreeneitblog.blogspot.com/2012/05/scom-2012-deploying-cumulative-update.html
My personal experience with the install will follow shortly.
Don’t you just like the constant improvement of the System Center products?