God. This is incredible. I just looked at this page to not get spoiled but wow. Every game (especially story based ones) should have a photo mode. This is a completely new way* of discovering a game, picturing and sharing an atmosphere, characters, travelling throughout the world and the playground built by the creators, enjoying your own experience and voyage in the levels. This is going far beyond the Wind Waker of GTA V cameras which were already great ways to take pictures....from the player's perspective.
*for most of the people, not only PC gamers with mods and all
But I don't think I'll spend too much time in it during my 1st run, or it will be 90% of the time playing with the photo tools and 10% playing the actual game.