Yeah it's a third one that was added with the Lynx and KFS2000. It's just hidden in the collection until it's unlocked. At least you’ll have some time to T1 the KFS2000, as I don't think the legitimate way of earning it has been found quite yet. I'm reading up on what's required so far, as I've been lax with the easter eggs, so have probably missed some player cards that'll be needed or so on.
Unfortunately, you're right that people have already begun exploiting it en masse, thanks to YouTube videos and guides for the glitch being posted on Reddit etc.