https://www.polygon.com/2017/11/3/16603910/starcraft-2-f2p-announced-release-date-blizzcon-2017

StarCraft 2: Wings of Liberty, one of Blizzard Entertainment’s most popular games, is becoming a free-to-play game. Company CEO Mike Morhaime announced the news during BlizzCon 2017’s opening ceremony, which streamed live from Anaheim, California today.

On Nov. 14, players will be able to play the entire Wings of Liberty campaign at no cost. If you already own that content, you will receive Heart of the Swarm at no additional cost.