Update: Managed to add event support last night, which is a pretty important feature if you want to draw things in the window. Right now it lets you prevent the application from closing with an unload event.
So yeah, it's going to be kinda like HTML5, but without the overhead of a full-blown web browser and everything and your app won't weight like 50 MB just for a simple hello world. The binary right now is about 500 KB instead.