I've been wondering this. During the day my iPhone sits in the dock at my desk. I do everything I can to minimize the number of cables not securely fastened in the tidy behind the desk, I don't like then either visible on the desk, or hanging where I can potentially feel them against my legs/feet. If I don't have a dock then the cable will have to just be on the desk, might fall down the back, etc, etc, and I'd hate that.
I'm sure someone will release one soon, even if Apple doesn't. We'll just have to be patient.