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Well, the interface is going to be different, for sure, with the new "metro style" but beyond that, it looks like it will be a pretty major update. The file system you noted, Resilient File System in MS Speak, is supposed to be noticeably more scalable and reliable. Hyper-V will be able to work in multi-tenant configurations. With a datacenter license, you can run "unlimited" virtual machines. I know there are some other licensing changes, but I'm not certain about the details.