Is it not HDMI 2.0 that basically is a quick fix Firmware, I know the same cables are to be used at 1.4a?
Edit :
Can my existing HDMI 1.x devices be upgraded with HDMI 2.0 features?
Currently, there are no provisions for doing such an upgrade. Because of the new enhanced feature set, any such conversion
would require hardware and/or firmware upgrades.
If there are such conversions, it would come from the manufacturer. Please check with them directly.
Does HDMI 2.0 require new connectors?
No, HDMI 2.0 uses the existing connectors.
Can existing HDMI cables support the higher bandwidths of HDMI 2.0 Specification?
Yes, existing High Speed HDMI Cables (wire only) will support the new higher bandwidths (up to 18Gbps).
Seems Sony did a simple Firmware update for Bravia X9 4K TV to make it 2.0
http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx