Hi
I found in a german computer magazin an article about a smal 3D scaner for an IPad.
http://www.heise.de/newsticker/meldung/Scannen-in-3D-2077747.html
This scanner was shown at the CES. There are also words about a SDK for Apps and so on.
The name at the moment is iSense. It should be buy-able in the second quarter of this year for only 500 $