Now that Economics has fulfilled it's commitment requirements, and it says 'lauching private beta soon...' - when exactly will this be? What is required to do before then?
See the answer to this post.
It appears that it always takes a few days.
Moreover as it says to the right of the screen
Committed users will be invited to the private beta.
So we wait for the invitation to show up in our SE accounts I guess.
Therefore, "what is required to do before then" is, in my humble opinion, just to
Write down as many as possible interesting Economics questions you might think of, and get ready to post them, one question per day -no more, no less.