The update is also said to include the latest security updates. It is available for the iPhone 4 GSM model, iPhone 3GS, iPad 2, iPad, and third- and fourth-generation iPod touch.
The update does not apply to the CDMA-based Verizon iPhone 4, which was given its own unique software update, iOS 4.2.7.
The last incremental update for iOS came in late March in the form of iOS 4.3.1. It addressed issues related to some cellular networks, and also fixed an occasional graphics glitch with the fourth-generation iPod touch.
Rumors of an iOS 4.3.2 began soon after, with claims that the minor update would include mostly bug fixes. Apple is believed to have largely turned its attention to its next major release, expected to be iOS 5.
Apple has said it will show of the "future of iOS" at this year's Worldwide Developers Conference, set to kick off on June 6 in San Francisco, Calif. WWDC 2011 is expected to be a software-only event, as Apple is rumored to have no plans to show off new hardware.