In a statement to AllThingsD, Apple has confirmed that the company stopped supporting Carrier IQ in iOS 5:
We stopped supporting Carrier IQ with iOS 5 in most of our products and will remove it completely in a future software update. With any diagnostic data sent to Apple, customers must actively opt-in to share this information, and if they do, the data is sent in an anonymous and encrypted form and does not include any personal information. We never recorded keystrokes, messages or any other personal information for diagnostic data and have no plans to ever do so.
Senator Al Franken! Paging Senator Al Franken! – December 1, 2011
Video shows secret software on millions of Android, BlackBerry, and Nokia phones logging everything you do – November 30, 2011