HDMI 1.4 was released on May 28th, 2009 and the first HDMI 1.4 products were available in the second half of 2009.
HDMI 1.4 increases the maximum resolution to 4K ? 2K, i.e. 3840 ? 2160p (Quad HD) at 24 Hz/25 Hz/30 Hz or 4096 ? 2160p at 24 Hz (which is a resolution used with digital theaters).
HDMI 1.4 now has Ethernet Channel (HEC), which allows for a 100 Mbit/s Ethernet connection between the two HDMI connected devices so they can share an Internet connection and introduces an Audio Return Channel (ARC).
3D Over HDMI, a new Micro HDMI Connector, expanded support for color spaces, with the addition of sYCC601, Adobe RGB and Adobe YCC601; and an Automotive Connection System.
HDMI 1.4 supports several stereoscopic 3D formats including field alternative (interlaced), frame packing (a full resolution top-bottom format), line alternative full, side-by-side half, side-by-side full, 2D + depth, and 2D + depth + graphics + graphics depth (WOWvx).
HDMI 1.4 requires that 3D displays support the frame packing 3D format at either 720p50 and 1080p24 or 720p60 and 1080p24.