bug i think. mine doesn't work well either. playing with it, fresh reboot, dm on it works. playing music from the stock player, ring, don't recall if it spoke, but the music never returned to playing. i have a blue tooth remote for music controls, with that paired, no speech, but music keeps playing after the message tone.
my gs2 driving mode, had the widget toggle, and just worked. (didn't have the remote though)
think we might need an update on this one