My friend and fellow RDS MVP Freek Berson has done some great work explaining what's new for RDS in Windows Server 2012. Check them out !
Posts on Windows Server 2012
Managing multiple RDS Deployments from one console with Windows Server 2012
The Feature highlights done after the availability of Windows Server 8 Beta
Feature highlight no. 4 “Installing RDSH prior to a scenario based deployment, no requirement anymore”
Feature highlight no. 5 “E-mail subscription for Remote Apps”
Feature highlight no. 6 “Demo environment within just a few minutes”