Got a response from the admin at Yahoo Publisher (see I told you the customer service is good) about the program being out of beta:
Golly, we're sorry, but we're not out of beta yet. We've just launched a new home page to link up you publishers ” whether you're in the beta or not ” with all of Yahoo's publisher tools and services. There's lots on offer there, so we hope you'll take advantage of them - - M2, Head Blogster (Admin)
So it may not be out of beta, but it has new tools and services everyone should take advantage of.