I for one would love to see this Duo Dock-like setup return with the iPhone. I always liked the old Duo system and have hoped that Apple would come out again with another dock like it.
In lieu of that, Apple could at least activate user interface Bluetooth profiles so we could use an external keyboard with the iPhone. Seems to me there's so much Apple could do with the iPhone as a real portable computer if they wanted to be serious about it.
The Case for the iPhone Duo Dock