This single port provides both USB 3.X data connectivity AND replaces and consolidates the MagSafe power port as well. While that's a neat advancement, it also implies many users will have to use a USB-C adapter or hub of some sort to use ANY of the USB peripherals they likely already own. You can learn more about the new Type-C standard at www.usbcmac.com
Fortunately Apple and 3rd party vendors are poised to deliver a range of USB-C drives, cables and adapters to help ease the transition. Stay tuned, I'll be featuring some of the new gadgets as they hit the market.