Jeff Wettlaufer announced a week ago that SCCM R3 is next on the SCCM list 🙂
This new itteration has a strong focus on adding possibilities for power management on clients. However this is not the only thing that will be added. There will also be performance and OS deployment improvements.
The beta is expected to start at around the end of October and release date near the end of March 2010.
Here is the link to Jeff’s post: http://blogs.technet.com/systemcenter/archive/2009/09/08/announcing-system-center-configuration-manager-2007-r3.aspx.