I found some info about 1.2:
When was the HDMI specification released?
The HDMI 1.0 specification was released in December 2002.
The HDMI 1.1 specification was released in May 2004.
The HDMI 1.2 specification was released in August of 2005.
The HDMI 1.2a specification was released in December of 2005.
What has been added in the HDMI 1.2 specification?
The HDMI 1.2 specification also adds features and capabilities that increase HDMI's appeal for use in both the CE and PC industries. Specifically, the features and modifications for HDMI 1.2 include:
* Support for One Bit Audio format, such as SuperAudio CD's DSD (Direct Stream Digital)
* Changes to offer better support for current and future PCs with HDMI outputs, including:
o Availability of the widely-used HDMI Type A connector for PC sources and displays with full support for PC video formats
o Ability for PC sources to use their native RGB color-space while retaining the option to support the YCbCr CE color-space
o Requirement for HDMI 1.2 and later displays to support future low-voltage (i.e., AC-coupled) sources, such as those based on PCI Express I/O technology
What has been added in the HDMI 1.2a specification?
With the release of HDMI 1.2a, CEC features and command sets and CEC compliance tests are now fully specified. In addition, the Founders have created version 1.2a of the HDMI Compliance Test Specification (CTS), which includes a CEC Supplement. HDMI CTS 1.2a has been updated for technical consistency with HDMI Specification 1.2a as well as to the recently released HDMI Specification 1.2.
Significantly, CTS 1.2a contains additional cable and connector testing and Authorized Testing Center (ATC) submission requirements. Specifically, under CTS 1.2a, the Adopter shall submit for testing to the ATC any new HDMI cable whose length exceeds previously tested cables.
Additionally, HDMI Licensing, LLC will maintain a list of approved connectors. For a device to pass CTS 1.2a testing at an ATC, all connectors on such device must appear on the approved connector list. To add a connector to this list, the vendor must submit to the ATC or HDMI Licensing, LLC full and passing testing results.
Is HDMI 1.2a backwards compatible with 1.2, 1.1 and 1.0?
Yes, the latest HDMI specification is fully backwards compatible with previous versions.