Após mais pesquisas, descobri o seguinte: Atualização do protocolo 8.0 para o Windows 7 SP1: Habilitando uma excelente WAN experiência do usuário para desktops virtuais do Windows 7 SP1
Are the RemoteFX and RDP 8.0 enhancements available for Windows Server 2008 R2 Remote Desktop Session Host? No, the RemoteFX and RDP 8.0 enhancements are not available for Windows Server 2008 R2 Session Host. However, a Windows Server 2008 R2 computer acting as a client access device will still get the Remote Desktop Connection 8.0 client and thereby get the benefits listed in the ‘client access devices’ section earlier.
Portanto, nenhum RDP 8.0 para o Host do Servidor 2008 R2 é planejado.