What I'd like to see is a proper media hub. Media could be stored on network drives, and the hub would only work as a way of "transporting" your media, be it pics, video or music. This would all be stream wirelessly on WLAN of course. It would also need a TV tuner (or perhaps several), so that you could watch different TV channels on your different TV's around the house.
It would need some proper connectivities, as it would basically be something of a "master device", connections for speakers etc.
It would need either a bigger remote, say something along the lines of a Beolink 7000, that would have some mechanical "magic" built in it, the Beo5/6 is too small IMHO. Also the user interface would need to be top-notch, fast and easy to use, and foremost work!
Connections would need to be easily adaptable to third party equipment.
The box itself would need to be something else than a black metal box. Style it up, add some mechanical parts perhaps, make it possible to have it hidden, but also possible to have it on display.
Price it sensibly. Make it future proof.
Something like this is what I would like to see. While I can do all this with my current setup (Apple) I'd much more like to have the proper B&O feel all the way. The exclusivity of owning something that your neighbor doesn't.