hard to say, it's probably defined in the NDA that can't be disclosed. The NDA can only bind those that sign to it, so nobody outside of these organizations has any reason to worry. It's an agreement, not a court order, nobody that isn't involved in the agreement is free to speculate.
I have no idea how this works. Would it cover everyone at the news org that signed it, or just the immediately involved journalists? It's a negotiated agreement between these two parties, it could be broad or narrow or somewhere in between.