What happens when you take Xamarin Forms, mix it up with a huge shake up of .NET... .NET MAUI or the full name of .NET Multi-Platform UI.
A single codebase, project to be able to code, test and build as well as deploy to not only native mobile (iOS, Android) but also to desktop forms too i.e. MacOS and Windows :)
It is part of a much larger change coming in .NET 5 but onwards to .NET 6 - one framework, many hats!
Here is the official link from the build conference announcement which obviously contains much more than just five minutes worth ;)
https://devblogs.microsoft.com/dotnet/introducing-net-multi-platform-app-ui/
Episode 6 - .Net MAUI