The StarCraft II Website announces the demo for the real-time strategy sequel has been replaced with the StarCraft II: Starter Edition, which allows anyone with a Battle.net account and an internet connection to play the following content for free:

• The first four missions of the StarCraft II: Wings of Liberty single-player campaign, including Mar Sara 1-3 and the choice to embark on Tychus’s first mission or Dr. Hansen’s first mission.
• The first two Challenges: Tactical Command and Covert Ops.
• Access to the terran race in Custom Games and Single-Player vs. AI.
• Access to the following custom maps (map selection may rotate over time):
  • Xel’Naga Caverns
  • Shattered Temple
  • Discord IV
  • High Orbit

Word is: "Any campaign progress and achievements you earn while playing StarCraft II: Starter Edition are automatically saved to your Battle.net account, and will carry over should you ever upgrade from the Starter Edition to the full version of StarCraft II: Wings of Liberty."