It’s really happening. The StarCraft II: Wings of Liberty campaign, ranked multiplayer ladder, and Co-Op Commanders will soon be available for everyone for free.
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Starcraft 2 Dev On The Effects Of Going Free-To-Play - GameSpot
No More Paid Content in StarCraft 2 - Blizzard
StarCraft® II - StarCraft II
StarCraft II Official Game Site
StarCraft II Free to Play: Legacy (Full Version)
Blizzard is making a 'StarCraft II' campaign free to play
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Starcraft 2 Dev On The Effects Of Going Free-To-Play - GameSpot
Starcraft 2 Dev On The Effects Of Going Free-To-Play - GameSpot
StarCraft II Free to Play: Legacy (Full Version)
No More Paid Content in StarCraft 2 - Blizzard
StarCraft II: Free to Play Overview