Interesting your December experience, because mine was very much like yours. I couldn't get my cover for the iPad pro until last week. By then I travelled already halfway around the globe and all went fine.
Last week tuesday I finally got the pen and iPad cover and was a happy man.
Worked the afternoon with an iPad perfectly suited to my needs.
When I came back in the evening I still watched a bit of movies and then placed the iPad on the desk. As far as I know I closed the cover.
Next morning I saw a crack starting at the upper right corner, going all the way to the left.
No damage on the metal, but yes it looked as if a tiny thing must have hit it, or TENSION IN THE glass together with the aluminum cause it.
I am not aware that anything could have caused it. It did not fall or had any pressure from my side and I didn't see anything during the whole afternoon or evening.
When I brought it to apple support they claimed that it was damaged by external forces.
1. Does anyone have the same experience?
2. Is there a potential info about tensions in the glass of the iPad pro leading to spontaneous breakage?
Whoever has heard about it, please let me know. I was considering using some more iPad pro's for my office, but it might be a bit too expensive if the glass has known issues and has to be replaced all the time.