I recently saw the Microsoft blog entry describing the new features of RDP 8.0 and how to enable this new functionality.
I successfully upgraded a Win7 Ultimate (x64) and Win7 Enterprise (x64) machine following these instructions. I also have a Win7 Home Premium (x64) machine which obviously does not have the "Local Group Policy Editor" and the instructions only reference policies and not registry entries.
I eventually took snapshots of my registry on my Win7 Ultimate machine before and after changing the policies to determine the registries keys changed. Here are the keys I noted and tried incorporating into my Win7 Home Premium machine which did not work.
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows NT\Terminal Services]
Any thoughts, ideas, or instructions for next steps would be appreciated. (UDP support and a resizable connection bar alone make this a worthwhile update for me!)