Late last night Apple quietly released an Apple TV v2.2 update, providing bug fixes and stability improvements and a few additional new features. While the obvious new features include things like Genius support to bring the Apple TV in-line with iTunes 8 and the 2008 iPod models, there are quite a number of other significant changes hidden away under the hood. As usual, we have gone through the Apple TV 2.2 in detail to see exactly what has changed…