currently there is a regen icon for units that have passive health regen. however the icon does not tell you the exact % hp per second heal, the % hp required to revive from a wounded state, or the requirements for the heal to activate such as 2 seconds without actions.
giving this information through the icon would go a long way to improving game clarity and explaining the hidden mechanics in this game.
I also hope that auras and healing abilities receive similar icons with detailed information on how they work when you hover over them for the same reason, as well as more niche abilities such as being unsnarable, poison mechanics, and not requiring limber/unlimber to fire and move.