Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
Apple's App Store Usage Numbers Suggest iOS 7 Adoption at 74%
The company puts iOS 6 adoption at 22 percent, and older OS versions at just 4 percent. The data from Apple is likely the most accurate adoption data we will see and is the most relevant for developers as its taken directly from the App Store.
Chitika reported numbers nearly identical to Apple's earlier this week, showing 74.1 percent of devices using iOS 7. For its part, Mixpanel's OS adoption data, which records information from apps that use its analytics SDK, measured iOS 7 adoption at 78 percent as of December 1, with iOS 6 usage at just under 19 percent.
For comparison, as noted by TechCrunch, the latest version of Android -- KitKat -- only reports a 1.1 percent adoption rate.