I'm not sure he'd have gone for the "You now invoke Siri with the button you use to turn the phone off" either?
I'd expect more of a "Force Touch where the Home Button should be to invoke Siri" method?
Apple used to do so well with UI* and pushing UI *consistency* across OS, Apps, generations of devices, etc.. Now you have multiple ways to unlock the phone and invoke Siri between iPhones launched on the same day?
Maybe I'm officially old, but this is just seems annoying to me?
* Yes, the Apple UI consistency ship sailed away long long ago, but that doesn't mean that stuff like this doesn't still make your brain itch if you remember the good ole days where we made fun of Microsoft for this sort of crap...