GDScript is just Python that has some tweaks.

For example to preload a child node you put this in a node's member space.

onready var enemy = $Enemy

Variables needing to be declared with the var keyword is the biggest change in the language.

var flag = some_function_result()

Other changes include expanding Python with more keywords useful for the editor and game programming.

It is very nice for prototyping. Still looking forward to that C# AOT support in later releases.