lower picture are fingerprints
upper picture is inconclusive, i'm pretty certain it's the reflection of a highlight though. That room has very very bright spotlights, as can be seen in other videos.
In general its just very very unlikely that someone would find scratches at this event. This devices have been brand new at the point of presentation and I'm pretty certain these things wouldnt scratch up in a quick pocket test. If that was the case, the return rates of these new green iPhones will skyrocket, no way that would pass apples QA.
There has been spottings of dirt getting easily caught in between the cameras though.