Starcraft II: Wings of Liberty (PC)Gameplay Preview
IGN - May 19, 2007
Submitted by SERAPHRowen (461)
at 11:52PM PST on May 19, 2007
There are bunch of great game details in here that aren't mentioned anywhere else.
The highlights are the admittance that the majority of design decisions were based around the professional gaming circuit, that the games story will take place four years after the Brood Wars storyline, and discussion about how Line of Sight will change in this iteration.
The article also mentions a fourth non-playable race that was hinted at in Brood wars, a Protoss-Zerg hybrid.