Twitter user Chronic, a past source of Apple leaks, posted a couple of interesting notes this weekend pertaining to iOS 5 and the iPhone. In one post, he links to a pair of screenshots purportedly from an iOS 5 device showing Internal Settings menus that contain options related to Nuance speech recognition technologies. One shot references a Mic on the space key, and the other Nuance Dictation, suggesting that iOS 5 users will have the option to tap a button on the virtual keyboard to start/stop dictation as an alternative to manually typing out a message. In the second, he claims that unlocked iPhones are headed to U.S. Apple Stores for a Wednesday rollout, with the following part numbers: MC603 (16GB, Black) MC604 (16GB, White) MC605 (32GB, Black) MC606 (32GB, White). If true, it would mark the first time Apple Stores in the U.S. offered unlocked iPhones; there is a possibility that the rollout could take place on Tuesday instead.