Neowin posted a news story that the Remote Desktop Client in Windows 7 is equipped with new features and enhancements via Remote Desktop Protocol 7 (RDP).

Below are the features introduced in Windows 7 Remote Desktop Client
Windows 7 Aero support
Direct 2D & Direct 3D 10.1 application support
True multi-monitor support
RDP Core Performance Improvements
Multimedia enhancements
Media Foundation support
DirectShow support
Low Latency audio playback support
Bi-directional audio support

I fired up the Remote Desktop Client in the latest Windows 7 build 7057 and tested few things. Remote desktop connection experience is very much improved compared to its previous versions and I also found the session to be incredibly responsive even while playing HD videos. Below are few screenshots.

Windows 7: RDP changes improve remote desktop performance