hmmm known problem you all say? Interesting.

My local dealer rep has had the following to say:

Condensation is normal. Instruct the owner to turn on the high beams for several minutes to dissipate the condensation. Any claims sent in to warranty for condensation will be charged back to your dealer.

This is straight from DC... So if your dealer is replacing headlamps for this- it could be a quite costly mistake for your dealer. Turning the highbeams on for several minutes will 'burn' off the water vapor.