iOS app developer FutureTap has received a crash report from a device running iOS 5. FutureTap notes the crash involved MKUserLocationBreadCrumb, which 9to5Mac notes is related to the maps/location functions in iOS and could mean these APIs have been altered in iOS 5.
Since Apple is now testing third-party apps with iOS 5, it likely puts the next version of the iPhone's operating system on-track for a public unveiling in June at WWDC. It's still not clear if we'll see iOS 5 released in mid-summer as we have previous major iOS updates, or if Apple will wait until the fall to release iOS 5 alongside updated hardware.
Apple iPhone 6