http://www.gameinformer.com/b/features/archive/2014/12/03/stare-into-the-dark-below-new-details-on-the-destiny-expansion.aspx?utm_content=buffer08682&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer&PostPageIndex=1
Read the second page near the bottom they state that's when it will be open to everyone.
It seems only normal will be available at launch.
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take everything game informer, or any games "journalism" site for that matter with a grain of salt. As of right now they're nothing more than tabloid garbage