Not the beta itself, just the beta iOS app. Republic simply needs to give Apple a fresh beta app preferably some time in the next 10 days.
Alpha in technology testing terms is actually the stage prior to beta. As for general availability (the next stage after beta), I’ve seen nor heard nothing suggesting that’s imminent by any means.
I’m sorry to hear about the voicemail. I’ll try to find some time to see if I’m able to reproduce the experience. I’ve been mostly relying on a third party visual voicemail solution.