In powershell v3 WMI cmdlets are replaced by CIM cmdlet which are used a little bit different then WMI cmdlets.
On example is the method invocation which cannot be done by referencing the object that contain the WMI data:
CIM objects don't have all the relevant and useful methods that WMI objects have.
To discover methods that can be used for a specific class name we use:
Get-CimClass -ClassName Win32_Process | Select-Object -ExpandProperty CimClassMethods
after discovering the methods available we can invoke a method by using the Invoke-CimMethod cmdlet:
$CIMProcess | Invoke-CimMethod -MethodName Terminate