Incgamers.com has done a comprehensive interview Starcraft 2 developers Dustin Browder (Lead Designer), along with Chris Sigaty (Lead Producer) and Samwise Didier (Art Director) regarding the game. Check out the full interview here: Incgamers.com
What other new units has come up since we last saw StarCraft II?
There are a number of changes, besides Zerg, it is [...]

According to Starcraft 2 lead developer Chris Sigaty, Blizzard is working hard at making the 3D engine un-intrusive as possible.
"It's a whole 3D engine, so there will be differences to some degree but our core goal out of it is to have that really fast-paced action, quickly grabbing units and assigning them to particular targets, [...]

http://www.youtube.com/watch?v=FQoBnKa-e4E

StarCraft II Zerg Gameplay from "THIS IS GAME" unveiled Mar 10th, 2008 in South Korea.

http://www.youtube.com/watch?v=L_8_zxOX32E

Korean pro gamer sAviOr plays as the Zerg in a 20 minute showcase of the current build of Starcraft 2. (Part 1 of 2)

http://www.youtube.com/watch?v=JQXEDciJZoI

Korean pro gamer sAviOr plays as the Zerg in a 20 minute [...]

Detailed report on the zerg, also written by Lord Norris. The following article was translated from Korean, so apologies for the bad English.
Comparing to Protoss and Terran, the change of Zerg is quite significant. Around the 20ish PCs here playing SC2, two sentences are heard of most: “Zerg airforce is so fxxking powerful!” and [...]

There is lots to talk about in Batch 32 and I’ll be answering questions through the day about these screeenshots so fire away I hope everyone enjoys them!
Community ScreenCraft: In addition to our Q&A Map Maker Series, Gameplay Series, Lore Series, we are going to include our Community ScreenCraft Series, featuring screenshots crafted [...]