First, can I be clear that I already know how to multicast, and using that without a problem.
What I would like to know is... how to use the "Improved Multicast Features" that are new for Server 2012 using WDS?
http://technet.microsoft.com/en-us/library/dn281955
Improved multicast deployment by eliminating the need for making a local copy of the install.wim file. You can apply the install.wim file while it is being downloaded without significant impact to the application process.
We have installed Server 2012, with WDS role and have multicast working (Windows 7 deployments). However, we do NOT see this improved feature being used at all. Multicast happens in exactly the same way as it did in Server 2008.
I can find no reference on how to utilise this improved feature correctly.