As we nudge closer to WWDC 2011, Apple has reportedly started to field-test iOS 5. This is based on crashlog reports received by iPhone app developer FutureTap. The crashlog didn't mention if the device was an iPhone, iPad or iPod touch but did show a device running iPhone OS 5.0, or what Apple has publicly refers to now as iOS 5.
Just received the first iOS 5.0 crash report. MKUserLocationBreadCrumb sounds interesting.