StarCraft II: Wings of Liberty's solo campaign will continue the epic saga where it left off in StarCraft: Brood War. The storyline chronicles the exploits of marshal-turned-rebel-leader Jim Raynor and features both familiar faces and new heroes. Players will be able to tailor the experience, choosing their own mission path and selecting technology and research upgrades to suit their playing style throughout the 29-mission campaign. Several challenge-mode mini-games will also be included, with focused goals designed to ease players into the basics of multiplayer strategies. In addition, dozens of multiplayer maps will be available for competitive play through the new version of Battle.net, which is launching alongside StarCraft II: Wings of Liberty. This new version of the service has been built from the ground up to offer an unparalleled online play experience, with new features such as voice communication, character profiles and achievements, stat-tracking, ladders and leagues, cloud file storage, and more.

StarCraft II: Wings of Liberty Collector's Edition Features:

• The Art of StarCraft II: Wings of Liberty, a 176-page book featuring artwork from the game
• An exclusive 2GB USB flash drive replica of Jim Raynor's dog tag, which comes preloaded with the original StarCraft and the StarCraft: Brood War expansion set
• A behind-the-scenes DVD containing over an hour of developer interviews, cinematics with director's commentary, and more
• The official StarCraft II: Wings of Liberty soundtrack CD, containing 14 epic tracks from the game along with exclusive bonus tracks
• StarCraft comic book issue #0, a prequel to the comic series
• A World of Warcraft mini Thor in-game pet that can be applied to all World of Warcraft characters on a single Battle.net account
• Exclusive Battle.net downloadable content, including special portraits for your Battle.net profile, decals to customize your units in-game, and a visually unique version of the terran Thor unit

Source:
http://us.blizzard.com