Sony's announcement of HDR support for the original PS4 yesterday even surprised some developers. The team behind The Witness didn't know it was coming, as they explain in a post about PS4 Pro upgrades coming to the game.
Jon Blow hasn't been shy in the past about discussing the unseen aspects of indie development, even going so far as to talk about the imperfections of creating indie games for Xbox Live Arcade. So I suppose we shouldn't be surprised he's being his usual candid self. More power to him. You can read the full post here.