Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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32-Bit Apps No Longer Supported in iOS 11
When attempting to open a 32-bit app when running iOS 11, the app refuses to launch, offering up a message that says the app needs to be updated to work with iOS 11.
32-bit apps are also not available when searching in the new version of the App Store, and previously downloaded 32-bit apps can't be installed through the Purchased tab.
Over the course of the last several months, warnings about 32-bit apps have gotten increasingly dire. With the launch of iOS 10.1 in October of 2016, Apple started warning customers that older apps "may slow down your iPhone."
In January of 2017, the first iOS 10.3 beta featured an even more serious message when launching a 32-bit app, which specifically read "This app will not work with future versions of iOS."
Given the warnings, it should come as no surprise that Apple has eliminated support for 32-bit apps, but it does render many older apps that have worked for years without updates unusable. There are likely many users who continue to use 32-bit apps regularly who will be surprised to find that those apps no longer work when iOS 11 rolls out to the public.
Apple started supporting 64-bit apps when the iPhone 5s launched in September of 2013. As of June 2015, all apps and app updates must use the 64-bit architecture, so apps that are still 32-bit have not been updated in at least two years.
Current iOS 10 users can check to see if there are any 32-bit apps on their iOS devices in the Settings app. Go to General --> About --> Applications to get to the "App Compatibility" section that lists any outdated apps.
iOS 11 is only compatible with devices that feature a 64-bit chip, meaning it works with everything that has an A7 or newer chip. Specifically, iOS 11 is compatible with iPhone 5s, SE, 6 Plus, 6, 6s Plus, 6s, 7 Plus, and 7, along with the new fifth-generation iPad, the iPad Air, the iPad Air 2, all iPad Pro models, the iPad mini 2 and later, and the 6th generation iPod touch.