It's only been a few months, but Google has made a lot of improvements to Flutter since then. It's now compatible with the iPhone X for one thing, and it also has screen reader support, right-to-left text, localization, inline video support and more. It also has improved integration with Dart 2, Google's own programming language. According to Google, Flutter has already been in use with production apps as well as apps that were featured on both Apple's App Store and Google's Play Store. One such example is the popular Hamilton app.
As you might expect, Google is releasing the beta at Mobile World Congress partly to entice developers. It's working on stabilization and is planning on adding more features like inline WebView, inline maps, and more. If you're a developer, you can check out more information here. And if you're a user like everyone else, well, hopefully this means better apps for everyone.
Catch up on the latest news from MWC 2018 right here.