Apple is expected to release iOS 5 in September alongside the iPhone5.

WorldWide Tech & Science. Roberto Gómez.

According to 9to5mac App Store developer FutureTap just revealed that they have received their first crash report from an iOS 5 device.

This means that Apple is currently field-testing their next-generation mobile operating system that runs on the iPhone, iPad, and iPod touch with applications from the iOS App Store. 

iOS 5 is expected to take on some new cloud-based features and will be officially unveiled at Apple’s World Wide Developers Conference in early June. Apple is expected to release iOS 5 in September alongside the fifth-generation iPhone

Source: 9to5Mac