An interesting article from tryolabs about Google working on making Swift a language with first-class language-integrated differentiable programming capabilities, that could be used instead of Python when you need speed or advanced functionalities.
It will still be possible to write Python code inside Swift code, and in this way have access to the huge quantity of great Python libraries.
Could Swift become a key player in the machine learning ecosystem? It is still to early to say but has certainly a big potential and now it is a great time to start looking at it and helping to shape the project.