HDMI 2.0 Equipment 100% backward compatible with all earlier HDMI standards and features
Max bandwidth increases from 10.2 Gbps to 18 Gbps
4K@50/60 (2160p) video, potential for 3D @4K
Up to 1536kHz audio sample rates
Up to 32 audio channels
The HDMI 2.0 spec does NOT define or require new cables or connectors, according to the information the HDMI Forum has released so far. Although the testing specification for HDMI 2.0 has not yet been established, and there are no cables that can be officially labeled as “HDMI 2.0 Compliant,” HDMI has stated that all current High Speed cables are capable of transmitting 18 Gbps when used with HDMI 2.0 electronics at both ends, and are therefore compatible with all HDMI 2.0 features. This is accomplished using signal processing that will be employed in all HDMI 2.0 hardware. For compatibility with all HDMI 2.0 features, new cables are not required for customers with High Speed cables, including AudioQuest High Speed HDMI cables.
Specification & Datasheet