In response to questions that Muttonhead has received due to his recent Dev Diary featuring the city of Stormreach, he provides answers and additional information. It's all there, in this forum thread.

Here's an excerpt!

Spunedagr - There are 4 Dragonmarked Houses represented in the game, and each of their respective wards will have its own unique architectural style.

Wren - We are definitely trying to reward curious minds. My hope is that you will discover new things each time you come back to a particular ward.

Metal - Magic in Eberron is definitely more akin to electricity in our own world, and we are doing everything we can to make magic a huge part of everyday life in Stormreach.