The (edit:) CURRENT beta version of #Signal is version 7.0.0.
There's a good reason for the round number. This will be the first version where usernames and phone number privacy are available outside of the staging environment.
From this version on, you'll be able to talk to people on Signal without revealing your phone number, and also, you may use Signal without revealing to people who have your number saved that you do.
This is huge.
https://github.com/signalapp/Signal-Android/compare/v6.47.4...v7.0.0