The Task Manager in Windows 8 has undergone some serious revision, check out this informative post from the Windows 8 Development Team for a run down of all the new features and layouts.
There’s a great post over at the Building Windows 8 MSDN blog detailing what Microsoft engineers looked at when revising the Task Manager to make it more effective and user friendly. Among the many changes are an increased emphasis on easily available and readable feedback (color coding and easy to read resource usage is one element of this) and better application grouping and organization within the Task Manager displays.
Hit up the link below to get the full run down of the new features and the reasons for their implementation.
The Windows 8 Task Manager [Building Windows 8]