Pico projectors have been on the market for a while now and one of the universal issues is that they are not very bright. The lack of brightness means they work well in a dark room, but in a room with light, they are not very good.
HP is rumored to be working on a new line of notebooks and tablets set for launch this year that will sport built-in pico projectors. The projectors would reportedly be where the webcam is on the notebooks now.
I would think on the lid facing away from the user would be where the projector would need to go. I wonder if notebooks with these projectors would have a hump to hide all the gear, presumably they would. No other details are available.
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