Full Series Season 2's Intragalactic Man (or Woman) of Mystery

So Filoni has said there is going to be a character appearance that he "can't even talk about" Who do you think its gonna be? My top guesses are:
1. Boba Fett- In making the clones they have a Temuera Morrison model they could tweak (though admittedly his would look younger) Plus could think of plenty of plausible situations for a bounty hunter to make an appearance.
2. Leia- Sarah Michelle Gellar posted an image of her in Leia buns. Papa Organa is already established on the show, maybe adolescent Leia will too?
3. Cad Bane- We got Hondo, Rex, and Ahsoka. Why not complete the CW reunion?
4. Ben- They got an Obi-Wan model. I hope this one doesn't happen though.

 

Fulcrum thread 2.0 here we come!

My bet is Kenobi or maybe Barris?

I say Kenobi because look boba would not change the show

Leia is still young but it could be her

Cad Bane same as Boba

Kenobi: the model is made so saved money
He could add a lot to the characters
It would make for an Epic episode as long as Luke does not show up.