Blizzard have provided media with a comprehensive look at unit artwork for StarCraft II, as contained in the BlizzCon press pack.

We've reproduced these images below, along with a gameplay video and the official fact sheet as provided to us earlier today;

[quote]StarCraft II continues the epic saga of the Protoss, Terran, and Zerg. These three distinct and powerful races will clash once again in the fast-paced real-time strategy sequel to the legendary original, StarCraft. Legions of veteran, upgraded, and brand-new unit types will do battle across the galaxy, as each faction struggles for survival.

Featuring a unique single-player campaign that picks up where StarCraft: Brood War left off, StarCraft II will present a cast of new heroes and familiar faces in an edgy sci-fi story filled with adventure and intrigue. In addition, Blizzard will again offer unparalleled online play through Battle.net, the company’s world-renowned gaming service, with several enhancements and new features to make StarCraft II the ultimate competitive real-time strategy game.

Fast-paced, hard-hitting, tightly balanced competitive real-time strategy gameplay that recaptures and improves on the magic of the original game
Three completely distinct races: Protoss, Terran, and Zerg
New units and gameplay mechanics further distinguish each race
Groundbreaking single-player campaign offers replayability by giving players choices in mission path and technology
Vibrant new 3D-graphics engine with support for dazzling visual effects and massive army sizes
Full multiplayer support, with new competitive features and matchmaking utilities available through Battle.net
Full map-making and scripting tools to give players incredible freedom in customizing and personalizing their gameplay experience

Check out the gameplay video here.