iOS 6 was launched recently and it includes some nice features like SLComposeViewController. However, I hesitate to break backward compatibility with iOS 5. Are there any stats on how many people have updated to the latest iOS version? I was unable to find figures published by Apple. When will it be advisable to use features specific to iOS 6?
UPDATE: I found iOS adoption stats from a company called Chitika: http://insights.chitika.com/2012/ios-by-device/. As of 10/1/2012, 60% of iPhone users have iOS 6. Unfortunately, this looks like a static article rather than a page with continuously updated figures, but one can assume using a bit of extrapolation that iOS 5 still (as of 10/8/2012) represents a large chunk of users.
Apple will probably never tell you, but here is a study using mobile ad impressions coming out of the Chitika Ad network which shows 60% of iPhones have been updated 2 weeks after the release of iOS6 (for the North American market):
http://insights.chitika.com/2012/ios-by-device/
Data from Chartboost suggests slightly lower adoption rates:
http://techcrunch.com/2012/10/05/after-early-boom-new-numbers-suggest-ios-6-adoption-may-be-reaching-a-plateau/
Mainly I guess due to fear of losing google maps and not getting that much in return (for older devices). Probably a good idea then not to target iOS6 specifically…