https://www.twitch.tv/videos/171389752At 00:58:15 you can see Elemental Arrowheads -- which seems like a reworked version of Elemental Ranger.
Elemental Arrowheads
1 AP Cost / 4 Turn Cooldown
Target a surface in melee radius. For one turn, elemental damage matching that surface is added to your ranged weapon attacks and ranged weapon-based skills.
Requires 1 in Huntsman
It says for one turn, but the buff shows two -- which is either a bug or skill means the duration lasts for one turn after it is first cast. The EA version of Elemental Ranger adds damage based on the surface the target is standing on. The damage isn't much and only works with basic attacks (from my experience anyways). If this is indeed the reworked Elemental Ranger and you also take into consideration the changes made to Executioner and various skills -- this could be a really good pick for rangers. Use a poison coated Arrow Storm on a fire surface or (this is a leap) use a cursed surface/Ricochet.