Remember that a product's availability to offer the features that are part of the HDMI 1.3 spec require more than "1.3 chips". THe features are not just made possible by the HDMI stack, but by other aspects of the product's circuitry.

For example, the lip sync feature requires all upstream products to have an EDID statement that reports their latency downstream with the "first" unit in the chain having sufficient buffer capability to do the needed delay. Similarly, xvYCC color and Deep Color require the proper organization within the product.

It is true, though that the 48 bit Deep Color is HDMI receiver/transmitter dependant, and there are no chips yet that handle the 16 bit per channel signals.

This is only part of what makes it all such fun to design a product these days, and then use it in a system.