Destiny, the new title that Activision Blizzard (NASDAQ: ATVI) is set to launch in September, retails for $60 and will likely rocket into a billion-dollar video game brand. But the company could actually make as much – or more -- through a major push into the free-to-play gaming model over the coming years.

Activision has already tiptoed into that business, Fool contributor Demitrios Kalogeropoulos notes in the video below. Its new Hearthstone: Heroes of Warcraft title requires no up-front payment to get started, but instead processes small charges from players who want to speed along their progress. 

Hearthstone is a card-collecting game from Blizzard. Source: Activision-Blizzard.

The title seems like a hit already, as Hearthstone has attracted millions of players and strong engagement and spending trends, according to the company. But that's really just the start for Activision: Hearthstone will soon expand to tablets and smartphones, and the company has two additional promising free-to-play entries on the way: Heroes of the Storm and Call of Duty Online.