I purchased a new Iphone 6s about 2 months ago. Today, I noticed a small scratch in the middle of the screen. When I looked closer, I saw about 6-8 hairline scratches on the screen. I was shocked to notice this, as my old Iphone 5 lasted over 2 years without a single scratch. I told my wife and she replied that she noticed a few small scratches on her Iphone 6 last week too.
I was told, starting with the Iphone 5, the glass was much more durable and you didn't need a screen protector to prevent scratches. My old phone was proof! I always keep a soft rubber case on it for extra protection, but never had issues with surface screen scratches. I was even surprised when my mother finally got an Iphone last year and bought a screen protector. I told her, "those aren't necessary anymore".
After some reading, this doesn't seem to be a one-off case. I am curious to see if Apple announces any factory detects for this new 3D touch screen.