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As such (and perhaps this is better suited for SE Meta), why have no Beta badges been awarded? I know I, personally, have fulfilled the requirements and I'm sure several others have as well.
Because we need to move out of private beta to get awarded badges about participating in the private beta. I participated in the vi/vim private beta and got that badge the day it went into public beta.
Today we entered the Public Beta phase and those who qualified, received the 'Beta' badge: