That's right. Its now through your phone as long as it supports 'hotword detection' over Bluetooth.. for example with recent Android phones you should be able to just go 'OK Google.. call Wife' and voila!
I have been to my Kia dealer and was told if there is a voice recognition button on the steering wheel then it should work. It has been booked in as a fault. What is the point of giving you the option if it doesn't work.
It depends on what phone you have if you have a iPhone then yes it will work if you have a different device go one the Kia audio site and see if your phone is compatible as mine will download part of my phone book but not all of it and it doesn't recognise voice commands so what I've done it's put my main phone number on speed dial