http://www.pcgamer.com/starcraft-2-is-going-to-free-to-play-later-this-month/

BlizzCon 2017 just got underway and Blizzard CEO Mike Morhaime has already dropped one big piece of news: StarCraft 2 is going free to play. 

The change will make the Wings of Liberty campaign completely free for everyone, while Heart of the Swarm will be given free to anyone who already owns it. Unranked and Versus AI modes are also free, while Ranked can be unlocked with ten "first wins of the day" in either of them. The Kerrigan, Raynor, and Artanis commanders are completely free, and all others are free up to level 5.