Finally, it's become patently obvious that Windows 8 has encountered a cooler reception than Microsoft might have liked, and that means nothing but opportunity for Linux. With Ubuntu 12.10 "Quantal Quetzal," in fact, Canonical's popular Linux distribution has actually surpassed Windows 8 in many respects, particularly from a business user's perspective.
Tremendous inertia will allow Windows' dominance to continue for years to come, of course.
Still, with Windows 8 the landscape shifted, I believe, and desktop Linux has begun to compete on an even footing. I can't wait to see where that leads in 2013 and beyond.