Edit August 2015
There is a beta driver now to support USB3 docks. See the linked forum for details.
Edit January 2016
Out of the box working:
Original answer
The video of the dock is not supported under Linux, and will not be for a longer time.
The dock uses a DL3XXX-generation Displaylink chip for video, driver support for this does not exist and is not planned by the producer in the near future.
I repeat: although Displaylink claims to support Linux in their FAQ, the latest generation does NOT support Linux
http://www.displaylink.org/forum/showthread.php?t=1748
But the NIC and usb ports work out of the box, so if you want an expensive usb-hub/NIC, go ahead.
USB2-based docks with displayport should be supported, though.