Meet LG LSM-100. It is a scanner and a mouse. You can use it to scan things or as a normal mouse. It has a glass window beneath it with a camera, 2 laser sensors and a laminating light.
Here is how it looks underneath.
If I have not heard wrongly, the mouse would be available from May at a steep price of USD120. BTW, it doesn’t scan like a A4 or A3 size paper. You activate a button and it will scan whatever under it as you move along. Watch this demo from Engadget.