“This document describes changes in Remote Desktop Services (formerly Terminal Services) functionality that are available in this Beta release of Windows Server 2008 R2, including changes to the names of role services and management tools. Remote Desktop Services provides technologies that enable users to access session-based desktops, virtual machine-based desktops, or applications in the datacenter from within a corporate network or from the Internet”.
EDIT #1
It’s a quick read and worth looking at if you’re interested in either Terminal Services or VDI.