Siri basically operates the same way on OS2... the main difference that makes her much more efficient is that you no longer have to wait for her to do something before putting your wrist down.
You can now just say "hey siri, tell my wife I'm on my home".. as soon as you see that siri has opened up you can put your wrist down and go on with your day. In a few seconds you'll feel a tap that lets you know that she heard you and she's doing whatever you asked. You no longer have to wait to click send, or confirm, or whatever the case may be.
In fact in my example you no longer get a "send" and "cancel" button... you just get a cancel in case she misheard you. If you do nothing she sends the message.