I'd guess it's for washer fluid, and that it might not be installed properly if you can see it (which might lead to it failing eventually).. Have the service center check it out. Probably an easy fix, just needs to be taken off and put back on so that it's routed correctly
I figured that is what it was...just odd that it lays loose on the windshield. I'll just take it in next time and ask them. OR stop by and see the 3's in the lot and see if they all look the same. Too bad no one who has one is seeing this and can compare, save me a trip out there.