Actually there was a discussion in a Q&A (i belive in the 2015 blizzcon) about adding a Heartstone tag for HotS, because Rafaam, Elise, Finley and Reno (and technically the Inkeeper) are not in the Warcraft game universe, only in HS, and if they would like to add them to the game it should be under the sign of Hs not Warcraft(because it was asked if they thinkin about adding one of these heros to the game and where would it belong, and the developers said they like the idea).
Posted: Feb 07, 2016