This is an open-ended idea, so bear with me. Basically it’s an R2-D2 figure on a platform interacting with one of those revolving gears (as he often does). There would be 2 motors, one to revolve R2’s head and one to revolve the gear. This toy would feature lights and sounds.
As for its function this gadget could be: a bookend, a USB hub, a recharging dock for your phone, a wireless speaker, a desk lamp, and so on. The gist of the idea is that R2 appears to be “assisting” you by turning that gear.
Personally I’d love to have him placed against the wall on my desk (like the picture above), connected to my computer via USB. He’d then react to me opening programs or writing files, stuff like that.
There are many possibilities for this gadget! I have a feeling that we’ll see something like this one day, as there seems to be a new electronic R2-D2 toy coming out every week.