Before lunch, cleaned my screen. Did not take my phone out of my pocket during lunch. There is nothing in my pocket (no keys, etc). I didn't have time to scan with my sand detector. Came back from lunch, went to check the time, and noticed two nicks in the screen, to the right of where the original scratch was that inspired this thread. At first I thought the screen was dirty, so I buffed the screen with a polishing cloth that came with my Transformer Prime. They still don't come out.
They look like small tiny white divots. Again they can only bee seen really with the screen off, so that's a good thing.
Over the last four years I have owned the G1, Nexus One, HTC Sensation before the Galaxy Nexus. I never had a single scratch on any of them (that I could see). I rarely used screen protectors. I always care for my phones. I have never even had insurance! Now in ONE MONTH of purchase my new phone has 3 wounds on the screen.
Either all of a sudden I have become some reckless, surfer dude who goes to the beach wearing khakis with my Nexus in a pocket and single grain of sand, or this phone has a much softer glass than other phones. That combined with the fact that the screen is jet black when turned off, which makes the white glint of the scratches stand out more than on other phones, which typically have a charcoal gray/greenish hue when turned off.
Whatever, I guess this is something I will have to live with, or get used to the InvisibleShield when it arrives. I love the phone too much too care anymore.