Source: https://blog.ethereum.org/2015/03/12/getting-to-the-frontier/ "We will say this: there will be at least two weeks notice before anything goes live. You’ll get plenty of news from blog posts, you’ll see the issue count go down, and we’ll start saying positive things about security audit feedback and so on. We will keep you in the loop!"
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"We will say this: there will be at least two weeks notice before anything goes live. You’ll get plenty of news from blog posts, you’ll see the issue count go down, and we’ll start saying positive things about security audit feedback and so on. We will keep you in the loop!"
I suppose that's just what happens with such a complex project, deadlines will be pretty fluid.