HDMI Ethernet Channel: 
Adds high-speed networking to an HDMI link, allowing users to take full advantage of their IP-enabled devices without a separate Ethernet cable. 
Audio Return Channel: 
Allows an HDMI-connected TV with a built-in tuner to send audio data "upstream" to a surround audio system, eliminating the need for a separate audio cable. 
3D: 
Defines input/output protocols for major 3D video formats, paving the way for true 3D gaming and 3D home theater applications. 
4K Support: 
Enables video resolutions far beyond 1080p, supporting next-generation displays that will rival the Digital Cinema systems used in many commercial movie theatres. 
Content Type: 
Real-time signalling of content types between display and source devices, enabling a TV to optimize picture settings based on content type. 
Additional Colour Spaces: 
Adds support for additional colour models used in digital photography and computer graphics. 
Automotive Connection System: 
New cables and connectors for automotive video systems, designed to meet the unique demands of the motoring environment while delivering true HD quality. 
Backwards-Compatibility: 
Fully backwards-compatible with existing HDMI devices and their features.