From Daniel Eran Dilger at Apple Insider:

It turns out that while the tech media spent most of 2013 complaining that Apple “wasn’t innovating,” Apple was secretly developing its new Mac Pro supercomputer, perfecting its Authentech-based Touch ID technology that the industry has been flummoxed to copy, completing iOS 7 (while Google took a Kit Kat break with Android Key Lime Pie) and OS X Mavericks (while Microsoft fiddled as Windows 8 burned), while also bringing an entirely new 64-bit mobile architecture into production ahead of the world’s leading chip designers and foundries (which didn’t see a pressing need to move to 64-bit and lacked Apple’s experience in doing so), and, as nearly a side project, spending billions to build out a series of new iCloud data centers…
via Jason Putorti