The next macOS will be called Big Sur, Apple announced at WWDC 2020.

It’s official. The next macOS will be called macOS Big Sur as Apple unveiled it today at WWDC 2020. macOS Big Sur brings an all-new design, new features to Safari, Messages and Maps.
For starters, macOS has a new spacious design, which Apple claims to make navigation easier. The curvature of windows corners has been changed as has been the palette of colours. The icons in Dock have also been redesigned. The idea behind the all-new design is to make macOS look more fresh and reduce visual complexity.
“macOS Big Sur is a major update that advances the legendary combination of the power of UNIX with the ease of use of the Mac, and delivers our biggest update to design in more than a decade,” said Craig Federighi, Apple’s senior vice president of Software Engineering. “With its modern and clean look, huge improvements to key apps including Safari, Messages, and Maps, and new privacy features, we think everyone is going to love the breakthrough experience that macOS Big Sur offers.”
MacBook users also get an all-new Control Centre with macOS Big Sur. The Notification Centre too gets redesigned widgets and notifications.
The biggest highlight of macOS Big Sur, however, is the new features coming to Safari. Now, Apple’s browser is way behind Google Chrome in terms of adoption but Apple claims it has made it faster and it is now the world’s fastest browser. Tabs have been completely redesigned to make navigating with Safari faster and more powerful by showing more tabs onscreen. Users can customise the new start page with a background image and sections like their Reading List and even iCloud Tabs. With built-in translation, Safari can detect and translate entire webpages from seven languages. Apple has also improved support for extensions — something that Chrome has been doing for a while — on Safari.
Safari will also enhance privacy and security with macOS Big Sur Users can choose when and which websites a Safari extension can work with, and tools like data breach password monitoring never reveal your password information.
The Messages app too gets a refresh on Mac with iPhone like features.Message effects let users add personality to their messages with balloons, confetti, and more. Users can now create and customise their Memoji on the Mac. Group messaging features will arrive on MacBooks with macOS Big Sur as well.