I guess Black Design Associates thought it would of been cool to put your iPhone 4 in a Leica i9 casing?
Not only do you get a cool looking case but the actual lens may work via the connector on the iPhone. The price point is said to be in the range of $900 ~ $1200.
BlackDA went a step further and created a Leica i9 concept that features a rangefinder styled housing that can be attached to an iPhone via a 30-pin connector giving full access to all of the phone.