I think just about every RPG needs a new game plus mode and this iteration of GoW is a RPG. I'd like to play the game again and I'd switch it from normal to hard, but I don't want to unlock skills, collect resources to craft, open chests to earn runic attacks, learn languages, etc again. I'd just like to experience the story and battles again. Also, I have to question the design idea of only allowing you to fully upgrade your weapons after you beat the main story. Depending on the order of how someone beats the main story, side missions, and fog & fire realms there might not be anything (or much) for someone to do once they beat the campaign, so they can now fully upgrade their weapons, but they might not have anything to do with them.
I guess adding a photo mode and whatever else is nice, but I'd rather focus on something more crucial like a NG+ option and gamers might need to pressure them on Reddit, Twitter, their forums, and other places for that to get done. I think the game director said they wanted to do one, but didn't have time, but then I read someone saying they tweeted that there are no plans for this addition anymore. To me, it feels incomplete and a shame if it's not added, because I probably won't ever replay the game from scratch. I love the game, it's definitely a 9 point something to me, but this (among other things) would prevent me from giving it a perfect score and probably should've stopped game critics too IMO.