This is the Modern Windows Task manager of Windows 8 M3 leaked screenshot:
Alternate way to get Windows 8 M3 Windows Task Manager in M1
Go to the following key in Registry Editor :
In right-side pane, create a new DWORD value TaskUIEnabled and set its value to 1
It is tested on Windows 8 7850 build by the developer.
It is nice to have first free Tool.