The statute contains a definition of "covert agent". If the person outed doesn't fit the definition, there's no violation. According to Wilson, Plame doesn't fit the definition.
I hope Rove says he's looking forward to seeing Wilson frogmarched and in handcuffs.
Fox had a legal expert on and according to what Wilson says in his book, his wife was not a covert agent and that the statute did not apply in her case.