Sources speaking to Ars have discovered evidence of new voice control features coming to iPhone OS 3.0. Apparently going by the code name "Jibbler," it looks like it will provide not just voice synthesis, but also voice recognition for the upcoming iPhone OS 3.0.

Not much information is known at this time, but according to our own people familiar with the matter, Jibbler appears be an enhancement to the iPhone SpringBoard application, the Finder-esque app that acts as a launcher and will support the newly announced 3.0 Spotlight search. Jibbler may be controlled via the iPhone headset—button squeezes could be used to record short voice segments from the user, which Jibbler will then interpret. Voice synthesis can then be used to give the user a response, similar to the latest generation iPod shuffle, which can "read" playlists and track names—the difference being that the iPhone hardware itself could handle real-time voice synthesis.

Our sources turned up references to classes and methods named VSSpeechSynthesizer, VSRecognitionSession, SBVoiceControlDisableHandlerActions, SBSensitiveJibblerEnabled, and SBVoiceControlSoundCompletion. SB refers to SpringBoard, and VS likely refers to Voice Services. The separate Voice Services classes leave open the possibility that Apple may eventually allow access to these services via the official SDK. There's no indication whether these voice features will be tied to newer hardware expected this summer or if the features will be compatible with existing iPhone hardware.

Besides the coolness factor that the voice control features add to the iPhone, they also bring the promise of voice-controlled dialing, a feature that other phones have had for some time. Also, it could aid in hands-free operation for safety in certain situations, like driving, and act as an assistive user interface method for those with some sight impairments.