You're on the list.
The next email you get will be the one that says Uzume is ready to download. After that, occasional notes when there's a new release — and nothing in between.
It may be a while. There is no installable build yet; the public beta will be free and notarized when it arrives.
In the meantime
Uzume is open source today. If you have Xcode and an Apple silicon Mac, you can clone it and build it yourself — that is the same thing the beta will be, without the signature.
A light in sound, a sound-like power in light.
Coleridge, The Eolian Harp, 1795