I really wish all the best for this project. To me here are the main points why this framework is really promising :

- Backed by webrender : Mozilla is putting large effort in webrender and Azul leverage all this work by using it as a backend. Too early to say, but it can potentially be far more performant than QT or GTK

- the "modern" way people do UI : you have Dom diffing backed-in like React (and like Flutter)

- backed-in data binding

- (live) CSS styling which is a subset of web CSS

- SVG support

- Extendable : you can use OpenGL to draw to a texture and pass it to Azul for display. This will allow for integration of 3D renderer, 2D renderer (for e.g Azul SVG drawing is using this mechanism), etc...

I'll definitely follow the progress with a lot of attention. I personally would prefer Azul so much more to GTK/QT/Flutter for developing apps