Hands Free in 8.3

I have read in the 8.3 reviews that....

With the iOS 8.3 beta 3 installed, users can now ask Siri to make phone calls using the iPhone's speaker. If you ask Siri to "Call [name] on speaker," the call will be made via speakerphone, enhancing Siri's hands-free capabilities. If you make the same request in iOS 8.2, Siri ignores the "on speaker" part and places the call as normal. The new feature makes it possible to activate Siri while plugged in by saying "Hey Siri" and make a phone call, all without needing to touch the phone or put on a headset for hands-free operation.

Can some knowledgeable user please confirm, that if this is now the case, can you answer a call hands free? I would like to use this option in my car and would appreciate confirmation before installing 8.3 on my iPhone 5.

Many thanks.