At first I thought that someone had just mashed together several known Bethesda slideshows (Arena, Terminator Rampage, Delta V) but I quickly noticed that it actually contains different pictures. In fact, a lot of the Arena related material was previously only known from magazine scans of varying quality:
The static interior images were likely intended to represent in-game locations like a tavern or an armoury, before it was decided to fully render building interiors in faux 3D like the rest of the game world. You can see the Daggerfall buckler on the armoury image.
The same package also contains unique screens from Rampage, and something from a few other games.

