from a little interwebs digging, looks like the camera module's using a 1/4" sensor, 65 degree field of view, F2.8 Lens (nice and fast!),
Question, is the lens formally 'stuck' into the sensor module housing?
looking at the images I can find it seems there may be some manufacturing adjustment allowed for to focus the lenses - as there's an almost screw fit looking setup to the lens.
If no answer, i'll fill out these details once I receive my two, I'll wreck one in the name of science to see if other lenses can be attached