We have heard that it was classified, and not classified, and covert, and not covert, and that her status didn't matter to Libby's case, except that it did matter.
I suppose it would be too easy for the CIA to make a public statement describing Plame's status at the time she was outed. Everyone on the planet now knows that she was an agent who did classified work, so I don't see how such a disclosure could harm national security.
The very fact that Fitzgerald brought no charges relating to the disclosure of classified material is an admission that no such charge could me made. We do know that her identity was not classified for other reasons, as well. Her identity was inadvertantly revealed a few years earlier, so was no longer classified. This whole case has been brought on trumped up charges by the media and a partisan prosecutor. Now they are in danger of being exposed and are trying to get as much mileage out of it as possible before that happens.
Oh, I forgot to mention that Victoria Toensing, the lawyer who wrote the law about revealing an agent's name, has stated in an editorial in the WSJ, that the law was not violated. .....but the media and the partisan prosecutor pushed forward anyway. Now the reporters are all going to be dragged into open court and forced to make their accusations in public, before tv cameras. This time the other reporters, the ones that were not called, will be forced to testify as well. These are the reporters who will testify that Plame's name was common knowledge in DC, among reporters who covered the CIA. This testimony will not only prove that the name was not classified and already in the public arena, they will prove that the prosecutor's case is nothing more than a he said, she said, between the left wing media and the defendant. The case will be dismissed. The repercussions will be that the reporters will have lost the protection of sources that they have always claimed and we know how much importance the left puts on precedence.