Microsoft announced today the future release of Windows 2008 R2 / Windows 7 Service Pack One. This Service Pack will include two major enhancements for Hyper-V including Dynamic Memory and Remote FX.
References: http://blogs.technet.com/virtualization/
Dynamic Memory will allow Hyper-V to achieve greater virtual machine density.
Additional Thoughts:
Dynamic Memory will have an obvious impact on datacenters trying to reduce costs and increase operating efficiency. However, Dynamic Memory will also help small business and / or development shops do more with less physical hardware.
Remote FX allows virtual machine users to watch full-motion video and Silverlight animations, run 3D animations, and use the Windows Aero Desktop.
Additional Thoughts:
Remote FX goes a long way to improving the user experience within the virtual environment. This feature combine with Direct Access could really improve the remote worker experience.