What's New in SCOM 2012

• Operations Manager has a new Setup wizard
• Operations Manager provides an upgrade wizard to help you upgrade your System Center Operations Manager 2007 R2 environment to System Center 2012
• Network Monitoring-Operations Manager provides the ability to discover and monitor network routers and switches, including the network interfaces and ports on those devices and the virtual LAN (VLAN) that they participate in.

• Application Monitoring-In Operations Manager, you can monitor Internet Information Services (IIS)-hosted .NET applications from server- and client-side perspectives to get details about application performance and reliability that can help you pinpoint root causes of incidents. 

  
  
  you can see more on 
  
  
  http://technet.microsoft.com/en-US/library/jj656648.aspx

SCOM 2007 to SCOM 2012 Upgrade conceptual steps

These are the step that you have to do before upgrade

• http://technet.microsoft.com/en-us/video/prepare-yourself-to-move-to-scom-2012