I also think that should be something in-between the Obsidian 1000D and the Obsidian 500D.
I want to buy an E-ATX motherboard, and would like to buy the 500D but it can't fit the E-ATX, so I can only go for the 1000D which I absolutely love, but I'm afraid is too big.
Please Corsair. I love the look of the new obsidian. Please make a similar 700 or 800, or something else that could fit a E-ATX