So, my new iPad Air 2 can see my iPhone 6 personal hotspot, even thought the hotspot is not turned on. In addition I can then connect to it without entering the key.
"If you’re out of Wi-Fi range, your iPad or Mac can connect to your phone’s personal hotspot when your iPhone is close by.* With the new Instant Hotspot feature, you’ll see the name of your iPhone in the list of Wi-Fi networks in Settings on your iPad, and in the Wi-Fi menu on your Mac. Just select it and you’re connected. And when you’re not using your phone’s network, your devices intelligently disconnect to save battery life."
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