It certainly is breaking news to everybody just hearing it.
No one holds "breaking" news.
The editor of the magazine has known this "fact". Heck, the reporters at the WP have known for decades.
It'll keep until the hourly break.
Rush Limbaugh commented how it was odd that CNN would spend one hour discussing this "news" today. He didn't seem too impressed.
"Woodward and Bernstein" have issued a statement that they will neither confirm nor deny the identity until the person dies.
And then we can do this all over again as "breaking" news.