IOS – How to automatically share the iPhone’s internet connection with the MacBook

iosmacosNetworktethering

I believe I heard from the Apple keynote that with the release of Yosemite and iOS 8 we will be able to automatically share the iPhone's internet connection without having to connect every time with hotspot (when within range). I now have Yosemite on my MacBook and iOS 8 on my iPhone, but I cannot see any options to enable this automatic connection. I currently connect with bluetooth to get my iPhone's internet connection.

Did I misunderstand or is there such an option?