A Japanese company by the name of RATOC has just unveiled its "REX-USB3HDMI" display adapter which provides a single HDMI output via connection to a USB 3.0 interface. Connecting over USB 2.0 is also possible, but one should expect less than smooth results in this instance.
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The REX-USB3HDMI measures 42 x 64 x 14 mm (WxDxH) and weighs in at about 26g. Inside its housing is a DL-3500 DisplayLink chipset which gave the device its certification. It supports resolutions of up to 2048 x 1536 and up to six of them can be connected to a single USB 3.0 hub without any apparent performance loss.
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RATOC's REX-USB3HDMI is expected to hit the market by mid-March at 10,500 JPY (about US $131).
RATOC releases 2048 x 1536-supporting USB 3.0 to HDMI Adapter
From the OneCebu archive, last updated February 10, 2014. Some details may have changed.