Microsoft just released the "R2" update to Windows Server 2003. This update adds several new "pre-Longhorn" features. However, it does not change anything Terminal Server-related, and unlike SP1, it does not add any new Terminal Server functionality.
This is old news to anyone who has been reading my site over the years, but I feel that it’s important enough to reiterate now.
All of the Terminal Server features that were slated for R2 (RDP6, seamless windows, application publishing, RDP over HTTPS) have been pushed back to Longhorn Server.