Someone on Colorad4x4 was on the trip and some others took pictures of it. Sounds like the guy had a moment of inattention (easy to get distracted with all the scenery) in one of the narrowest sections. His driver side tire climbed up a rock on the inside of the trail and then slid sideways which pushed the outside tire off the edge of the trail and it caused it to roll over. Sounds like it rolled 2 or 3 times before coming to a rest like it is in that picture.
Luckily, both occupants walked away from it with minor injuries. Both were wearing their seatbelts, which likely saved their lives since other stuff was ejected from the Jeep.
Here are some better pictures...
and another member posted a picture from the spot where this supposedly happened from a previous trip...
Definitely pretty crazy to have happen, and it points out that you need to pay attention to seemingly obvious rules like wearing a seat belt and focusing on driving. These guys are just lucky that they only ruined a brand new jeep with 10k miles on it and didn't get hurt or killed in the process.