The Colossus
"The towering colossus is a protoss robot design dating back to the bloody conflicts of the Kalath Intercession. It strides across the battlefield on four tall, slender legs which give it an extremely high level of mobility. The great height of the machine allows it to step up and down cliffs and other steep elevations with little difficulty, and gives it a dominating field of fire..."
continue reading here.
http://www.starcraft2.com/features/p...l?tab=colossus 
Discussion on the Colossus itself can be found
here
The rest of the Protoss units have been compiled here:
Protoss Unit List Question and Answer with Blizzard Batch 1-4
Similarly Blizzard RTS community manager Karune has answered several Questions regarding Starcraft II. A compiled list of these Q&A can be found at the below link. An Example of these questions is the graphic seen for Nukes before hitting and a question of The Mothership time Distortion ability.
Starcraft II Q&A: 1-29 
Heute
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