I'd actually be pretty happy if it just projected a reasonable-to-use keyboard on the table. I could work off the screen on a Note, it's big enough and high resolution enough for lots of work.

edit I'm thinking basically of this use-case, but with the projector in the phone.

http://www.brookstone.com/laser-projection-virtual-keyboard

edit apparently this is as close as is available (almost)

http://www.ctxtechnologies.com/products/vk300-iphone-docking...