Among the new iPhone 6s and 6s Plus revealed by Apple last week coprocessor within the chipset A9 M9 was to detect events in the context without using the CPU. In this way, you could activate Siri by voice command without touching the phone. But apparently, there is something else in mind.
According to Ubergizmo relieved, voice recognition could bring one more feature: the possibility that Siri identify the speaker, not activated when anyone invokes. A layer of security for voice commands that requires no PIN entry or to read the fingerprint through Touch ID.
This feature will be present with IOS 9 which just hit the Apple mobile teams on 16 September. Just have to see if iPhone will be available with the Plus 6s and 6s, or if older computers also may use this functionality.