There was a smattering of 'news' when a co-defendant admitted as much earlier this week. Plus I think David Greenglass long ago maintained he lied in a deposition incriminating Mrs. Rosenberg, Ethel, in order to protect her sister his wife.
The latest wrinkle was that the prosecution held the death penalty over them both in order to get them to give evidence, but they held firm.
The common wisdom is that Julius was an active spy and Ethel was not, but was aware of what Julius was up to and endorsed it.
The main provider of atomic secrets was, of course, Klaus Fuchs, a German Communist who was also one of the scientists who came over with the English group and worked in Los Alamos.