Blizzard has no plans to transition Starcraft II to a free-to-play business model. Game director Dustin Browder commented on the matter during a recent Reddit Ask Me Anything session, saying though such a switch may work for certain games--like Team Fortress 2--it would not work for Starcraft II.
"We have no plans to go free-to-play in the traditional sense. We do have a trial version that allows players to check out the game but it isn't like Team Fortress 2," Browder said.
"Valve did make a lot of changes to Team Fortress 2 to make that game work for free-to-play," he added. "We have not yet found design choices for Starcraft II that we would be happy with to make it free-to-play, so we aren't going to do it."
In September last year, Browder said Blizzard was "looking at" turning the multiplayer portion of Starcraft II into a free-to-play experience.
The Witcher developer CD Projekt Red recently called the free-to-play model "strange and awkward." Studio head Adam Badowski said though there may be money to be made in this market, it is still "far from perfect."