I believe this timing of this story is Hillary's. She knew the Senate race would center on presidential impeachment since Cox will be her opponent. CNN will air now watergate thoroughly, trash Nixon over again, and discredit Cox for the Senate race.
This is why the story is out at this time IMO.
Obviously Deep Throat was devious in obtaining info. But Hillary was even more devious in her "ways to bring Nixon down" which were deemed not only illegal but unconstitutional. Who knows what Felt knows about Hillary.