Apple has announced that 90% of devices are now using iOS 7. The adoption level was measured by the App Store during a 7‑day period ending July 13, 2014.
Apple didn’t break down adoption levels for various versions of iOS 7; however, it did say that 9% of users were on iOS 6 and 2% are on earlier software.
Apple has already released a beta version of iOS 8, its next generation operating system, to developers. There are numerous improvements in iOS 8. Here’s a few of the changes we’ve posted on already: Continuity, Handoff, AirDrop, Instant Hotspot, Health, iCloud Drive, Family Sharing, Photos, Camera, Mail, Safari, Messages, QuickType, Third-Party Keyboards, Interactive Notifications, Spotlight, and Contact Shortcuts