With yesterday’s release of iOS 4.2 for the iPhone, iPod touch and iPad, Apple also released Apple TV Software Update 4.1, its first major upgrade to the new second-generation Apple TV, adding AirPlay video support and fixing a number of issues from the initial release. We note up front that there is some confusion as to what the actual version of the Apple TV update is, since the version numbers are not entirely consistent. The second-generation…