The rear of the USB-C dock for the new MacBook offers ports for Gigabit Ethernet, two USB 3.0, HDMI and the critical Power Delivery (PD) for charging the MacBook while it is docked through its single USB-C port.
At 10Gbps, many storage options will work well with USB Type-C. Here's a Unitek 'toaster' style SATA drive solution that is hot-swappable and can also clone drives across the two bays, or offer full access to both at 10Gbps.
This adapter hub from j5create offers Ethernet, DisplayPort, USB 3.0 and a Power Delivery (PD) port. This is the USB-C plug you would run from the hub to the wall to charge the notebook the hub is plugged into. It will be an important choice to make when buying adapters and hubs -- do you want to be able to charge your device through this or not? Another very similar hub offers HDMI instead of DisplayPort.
Expect to see many drives like this one from TopDisk. USB-C flash storage with both the USB-C plug plus a traditional large USB connector. This will help bridge the gap nicely through the next few years of transition.
USB-C connectors will also be driving devices that still use the USB 3.0 standard. The plug just delivers whatever standard is being pushed across it. In this case, a slower Gigabit Ethernet connection (3.1 can hand 10 Gigabit) can be delivered, or a slower USB hub.
Whatever screen connection you need, USB-C will let you hook it up. It supports DisplayPort, HDMI, DVI, and VGA. Just add your adapter. Dual-screen output options will also be available. These adapters by Wiretek all include Power Delivery (PD) ports and one USB 3.0 port.
USB-C can also accommodate different cable types. This example from Elka International Ltd is an optical cable. This would be used only in very specific scenarios, but it shows how diverse this port can be.