Desired State Configuration is a feature of PowerShell V4, but one that was quite incomplete. In V4, IMHO, DSC is a really cool proof of concept. It works for a limited set of resources, but is not complete. Microsoft (and the community) need to, and are, publishing more resources. I suspect that V5 of PowerShell will see the completion or near completion of the resources needed by IT pros to manage most data centres.
To see that's in the resource kit, you can go to The TechNet Gallery and get it.