System Center 2012 was released was released yesterday and as a result all System Center 2012 products are available now! You can read more about the Microsoft Private Cloud here: http://www.microsoft.com/en-us/server-cloud/new.aspx and you can download the Microsoft Private cloud Evaluation software form the TechNet Evaluation Center: http://technet.microsoft.com/en-us/evalcenter/hh505660.aspx
Microsoft also created a System Center 2012 track on Microsoft Virtual Academy.
Currently there are 2 courses. But new courses will be added in the near future.
Start learning System Center 2012 now: https://www.microsoftvirtualacademy.com/colleges/SystemCenter2012