During Blizzcon 2019, it was revealed that the various heroes from the crossover title Heroes of the Storm will be free-to-play during the entirety of the three day convention. The news was also discussed by Twitter user DrTechMD through his most recent status update. Blizzcon 2019 will run until November 3rd, giving players a solid weekend to try out the unlocked characters:

Plenty of other announcements have been made so far during the opening of Blizzcon 2019. Overwatch 2 -- which was probably one of Blizzard's worst-kept secrets for this year’s BlizzCon -- was officially announced and will feature four-player co-op Hero Missions, a new PvP core gameplay mode called "Push," and a new graphics engine.

The next World of Warcraft expansion has also been revealed and it looks like players will be traveling back to Icecrown. Shadowlands will be available next year and bring tons of new places to explore in the large world of Azeroth. The trailer also mentions that you can "choose a covenant," showing what looks like leaders of each of the four zones.

Diablo 4 finally made its appearance during the opening ceremony and is going back to the franchise's "darker roots" with a first look at Lilith. Gameplay featuring the first three classes were also shown: Barbarian, Sorceress, and Druid. Druid class will be coming back to Blizzard’s action RPG franchise fully capable of becoming a werebear and werewolf. Maps seem to have a bit more verticality as the barbarian attacked from a higher plateau to the ground below it. Diablo 4 will bring back PvP zones.

Heroes of the Storm is a crossover multiplayer online battle arena video game. The game features various characters from Blizzard's franchises as playable heroes, as well as different battlegrounds based on Warcraft, Diablo, StarCraft, and Overwatch universes. The game is free-to-play, based on freemium business model, and is supported by microtransactions which can be used to purchase heroes, visual alterations for the heroes in the game, mounts, and other cosmetic elements.