This is fantastic news! And they decided to include the Chromium HSTS Preload list too. I've submitted something like ~30 domains to the list, and having them covered in newer versions of IE automatically is a very nice thing.
Progress is progress.
Not too sure about signatures yet: Ed25519 is definitely one contender, but I don't know where that'll end up.
Submit your domains: https://hstspreload.appspot.com/