Let Me Explain This

There are the existence of emails. They are probably nothing. (Edit: They may not even be Hillary's emails.) But if the mere existence of the emails is leaked before the FBI says anything, the FBI looks bad. So they went ahead and got ahead of the story and any potential leak by simply sending a letter to Congress.  And all they are saying is: We are going to look at the new emails. To call it "re-opening the case" is a reach.

Edit: And, once again, I'm being proven right. Just didn't think it would happen so quickly.