My bigger question is really what the experience is like accessing files and playing media that resides on my Essentials server from a Windows RT device (or otherwise non-domain-capable system) but, first, where is the My Server app for Windows 8/RT? Not yet released? Sounds useful for something like maybe a Surface with Windows RT.
Referenced here: http://technet.microsoft.com/en-us/library/jj730373.aspx
Using My Server App for Windows 8
You can access shared folder through Windows 8 using the My Server app for Windows 8. You can download this app from theWindows 8 App store.
Alex Nichols http://blog.alexnichols.net