Starting with ProTools 8.0.5, Avid no longer supports new development for HUI protocol and has left HUI inside Pro Tools as a 'Legacy Protocol'. A clarification of what is supported in Pro Tools for HUI can be found in the Digidesign User Conference site here: http://duc.avid.com/showthread.php?t=338093.
We have tested FaderPort in HUI mode with many versions of Pro Tools to show the differences in behavior between releases.
Since the release of Pro Tools 12, this chart does not need to change as the functionality matches Pro Tools 11.
*NOTE: The FaderPort itself has never changed its HUI mode implementation. Any differences or changes in functionality from version to version are a reflection of changes in Pro Tools HUI implementation and support.