Finally Microsoft Server Team has announced SP1 RTM for Windows 2008 R2 which does also include Dynamic Memory and RemoteFX:
Windows Server 2008 R2 and Windows 7 SP1 will Release to Manufacturing (RTM) today. On February 16, both will be available to current customers of the Windows Volume Licensing program, as well as subscribers to Microsoft Developer Network (MSDN) and TechNet. On February 22, both will be available to all customers through Windows Update and will also come preinstalled on new servers ordered.
More details around SP1 announcement can be found here: