Ethernet: example scenario given where dock has wired Internet connection; in console mode the system uses this connection, and in portable mode, the system can communicate wirelessly with the dock to access the wired connection [T:0560]
....woah.
Wii U does this and it works brilliantly, especially given how reliable/lag-free the wireless connection from the Gamepad to the Wii U is(as long as you are within range). Not surprised that this feature is returning, but it's awesome to have a confirmation.