They split the notification shade and control panel into two separate screens, accessed via a swipe down from either the top left or top right portions of the phone. It’s quite similar to how iOS has worked for a long time now. I can see the benefits if you’re someone who receives a lot of notification spam, because now you can see more of that on a single screen, but I’ve always been very strict with app notifications so it’s essentially watered down the usefulness of both. It’s far from the end of the world, though, and I’m sure I’ll get used to it.