Well most probably 15th February will be the Vista SP1 releasing date.There are many hardware ecosystem supports and enhancements.In case of Vista Media Center we will have the following enhancements.:-
#Adds support for creating a single DVD media that boots on PCs with either BIOS or EFI.
#Enhances support for high density drives by adding new icons and labels that will identify HD-DVD and Blu-ray Drives as high density drives.
#Adds support to enable new types of Windows Media Center Extenders, such as digital televisions and networked DVD players, to connect to Windows Media Center PCs.
#Enhances the MPEG-2 decoder to support content protection across a user accessible bus on Media Center systems configured with Digital Cable Tuner hardware. This also effectively enables higher levels of hardware decoder acceleration for commercial DVD playback on some hardware.