Thunderbolt is one of those tech innovations with a lot of promise, but not much felt effect for the average user. Thunderbolt docks can change that, and the new Elgato Thunderbolt 2 dock promises a much more complete upgrade vs. the Thunderbolt docks of years past. With USB charging, 4K output via the HDMI port, both audio out and microphone in ports, plus three USB 3.0 ports and a Gigabit Ethernet connector, it's a way to make use of those Thunderbolts on your MacBook for something practical.
Plugging the gaps in today's Macs: Elgato Thunderbolt Dock • The Register
Elgato Thunderbolt™ 2 Dock
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Kanex Thunderbolt 2 Express Dock review - The Gadgeteer
Connect everything to your MacBook or Ultrabook at once. Two Thunderbolt 2 ports, to daisy chain up to 4 more Thunderbolt devices Built-in HDMI port
Elgato Thunderbolt 2 Dock - with 50 cm Thunderbolt Cable, 20Gb/s, 4K Support, 2X Thunderbolt 2, 3X USB 3.0, Audio Input and Output, Gigabit Ethernet
Review: Elgato's Thunderbolt 2 Dock is a faster, one-cable hub for all your Mac peripherals - 9to5Mac
Review: Elgato's Thunderbolt 2 Dock is a faster, one-cable hub for all your Mac peripherals - 9to5Mac
Elgato Thunderbolt 2 Dock Review