Kevin Timmons, General Manager of Microsoft's Datacenter services, just posted a blog post on the next step in Microsoft’s datacenter evolution, which is consistent with the vision that we’d previously laid out as our Generation 4 datacenter. Our plan is to move towards pre-manufacturing every part of the datacenter and assembling them onsite based on the class of service to be delivered and supported.  By eliminating over-provisioning and maximizing productivity on an ongoing basis we are recognizing that each datacenter is a living organism that needs to be flexible enough to adapt quickly to meet our own demands as well as the demands of our customers. 

This is a great effort to help drive efficiencies and help reduce the overall impact of data centers. You can read the full post here.