Many games today use neural networks for AI. But abilities of NN is much wider and cooler. Imagine game whole working on NN. Balance is not needed anymore cuz neural network can learn on your actions. All game variables can be tweaked in real time using neural networks based person who playing.
Imagine casual game. All game designers have a simple question during design time - how much time level should take. If we use neural network we can change this time based on user experience based on every person.