Is this still going on?
This supposed investigation is a multimillion dollar hoax. Plame was outed by the CIA itself. A reporter calls in, asks if she's CIA, they say "yes". If you are undercover, they don't give you up to anyone calling in who might like to know.
If they give you up to anyone calling in to ask, you aren't undercover.
So, what is Fitz doing, investigating something he already knows the answer to?
Getting rich, I'd say.