An overwhelming number of developers are updating apps for iOS 7.
Of 575 valid responses, 545 developers indicated that they were
working on an update for iOS 7. That’s an adoption rate of 95%!
52 percent of those are going iOS 7-only. I’m not surprised; the changes are so deep, it’d be hard to support both 6 and 7 with a cohesive UI. And there’s so much good stuff — like Text Kit — that is only going to be available in 7.