Fortunately, the connector's shape has not changed. allowing for backwards compatibility with previous HDMI connectors. This may disappoint those hoping for a sturdier socket to help support those suddenly-popular dongles. The cables will also remain the same, as the group states that the current version of high-speed Category 2 wires can handle the increased bandwidth.
The HDMI Forum has listed additional specs in its FAQ, including that HDMI 2.0 is able to handle up to 1536kHz audio sample frequency, dual video streams for multiple users on a single screen, multi-stream audio up to 4 users at once and support for 21:9 widescreen displays.