9to5mac discovered new evidence includes five well iOS voice recognition technology from Nuance. An Apple employee sent to the site a screenshot where you can clearly see the icon of a microphone that activates the speech to text. By pressing the button, the device will save the text to transcribe dictated by message.
This is not the first time that there is evidence of integration of this function in iOS. However, it is impossible to know whether this feature is present in the final iOS 5.