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They’ve been working on a cloud backup feature, which might enable this.

Session eliminated perfect forward secrecy. Big no for those who take encryption seriously.

They do not at this time intend to drop the phone number requirement, as they see it as an anti-spam measure. Meredith Whittaker has said as much. Phone number privacy is a project independent of requiring phone number at signup, and it just prevents other users from seeing your number.

Usernames have not been released yet. When they are released, phone number will still be required for registration, but you will be able to hide it from other people on Signal.

Book Tracker on iOS is fantastic for my needs. Not really any social features, but I don’t need those.