The late-October Mavericks release is planned so Apple could focus the majority of its software engineering resources on pushing out iOS 7 alongside the new iPhone hardware over the next couple of weeks.
The report notes that for both OS X Lion and OS X Mountain Lion, Apple released the new operating systems the day after an earnings release. Last year, Apple held its earnings call on October 25th.
Apple is expected to release numerous hardware updates which could arrive alongside the new operating system including Haswell MacBook Pros, iMacs, and possibly the new Mac Pro.
Stay tuned on Twitter, Facebook, Google+, or RSS for the latest updates. In the meanwhile you can download the new wallpapers from Mavericks here.