We managed to snag confirmation of the upcoming 5.1 update to Lollipop just a few hours ago, but our tipster has already found one of the more obvious changes to the user interface. Google has tweaked the behavior of the Wi-Fi and Bluetooth settings toggles/widgets from the Lollipop Quick Settings menu to allow users to connect to networks or devices without going into the full-page settings menu.
If that's a little confusing, here's how it works right now: when you lower the notification shade to the Quick Settings menu, you can either toggle Wi-Fi or Bluetooth on or off by tapping their respective icons, or tap the word "Wi-Fi" or "Bluetooth" instead to go to their respective menu pages.
In 5.1 the Wi-Fi and Bluetooth text includes a little arrow pointing down, indicating expandable functionality. Touch the text on an upgraded phone or tablet and you'll open a small list of the closest Wi-Fi networks or Bluetooth devices. This allows you to make or switch connections without leaving your current app. If you need to go to the full settings menu you can tap "more settings," or just hit done when you're, you know, done.
This isn't an earth-shattering change, but it's a welcome one for people who are constantly flitting between different Wi-Fi networks. It also makes the built-in functionality a little more obvious - the dual toggle/shortcut behavior in Android 5.0 was a little confusing, especially since the Wi-Fi and Bluetooth settings worked differently than the other toggles.
Here's a video demo (thanks, Archie411!):