The word "Pro" is in the title of the product... it is also your higher-priced flagship model - you MUST know that professional power-users are going to purchase these units and plug in all SORTS of peripherals.
There REALLY SHOULD (at least in MY humble opinion) be an Apple-designed solution to users that want/need to "dock" their computers. Maybe a high-end model that has a concealed multi-pin bar on the bottom that connects with the dock... I mean honestly, between Ives and the entire Apple industrial design team, I am sure they could find an elegant solution to docking a laptop. I'd rather have one, persistent unit that I connect my ethernet, audio in/out, USB (over 6 devices and a hub), firewire drives and the occasional firewire camcorder, video out, power/charging... there's a whole host of reasons people need to keep things connected to a docking station instead of repeatedly plugging & unplugging numerous connections.
I'd love to think they already have a solution - or many - in the works... or even completed... but if that's the case, then why not implement...? Is the demand for "dockability" not high amongst Apple portable users...? I dunno. I just wish there were an elegant solution.