Blizzard announced today during Blizzcon 2016 two new playable characters that would be joining the Heroes of the Storm roster. They are Varian and Ragnaros, from the Warcraft franchise.
Varian innovates as it is the first multi-class hero in the game; it can be played as a Warrior or an Assassin. As far as Ragnaros, he looks like a destructive long-range character, one move that was shown was lava streams that can burn a lot of enemies; according to Blizzard, entire lanes of minions.
Varian will be released on November 15, while Ragnaros will come sometime in December.