Simaudio will be offering its MiND streaming system as an upgrade in the 380D. This will allow you to connect the 380D to your computer or Network Attached Storage device via your home computer network (via Ethernet cable or wirelessly - high def is not supported on wireless, I don't think). Using the Simaudio MiND system will allow you to access and control your entire music library, and your 600i (through a Simlink cable between the 380D and 600i) with a single app on your iPad. In theory, using the MiND system to stream your data directly to the 380D should give you better sound than using an S/PDIF or USB (which add jitter) to carry a digital signal to the 380D from a computer.
I'm anxiously waiting to see what the MiND software interface is like myself!