I don't think anything can top this game this year. It does (almost) everything right, from the look of the game to the just big enough open world. The combat is the best "Batman-combat" to date, being just hard enough to pose a challenge the entire game while also being easy enough to not become annoying. Not even going to start gushing about the Nemesis-system, as I feel that has been praised by everyone, but it really makes the game special.
And now they have done yet another thing that cements it as my "Game of the Year". Such a simple little thing that most games should have. A photo mode. Why don't more games add this? Is it difficult to implement, is it something that just doesn't occur to the ones who could add it in? Would be interesting to know. I do hope more games follow suit after this, because it's fun to try and capture cool moments. Then slap some silly filter on it.