Lemur already has animations… though you still have to write your own effects as there aren’t any standard ones yet. It’s not too hard, though, as many primitives already exist.
See:
My original announcement thread… thought I had a video link but I guess not:
My test app had buttons flying around and rotating using animation. I guess I didn’t capture a video. Closest I have is the fades in this UI:
They are done with the effect system so are automatic as pages are opened/closed.
Here is the section of the docs page with some examples: