Who is the faceless?

With the recent lore update, we learned that Noxus is now ruled by a triumvirate. Swain, Darius, and an unknown third individual.

Has it been hinted anywhere at who this person could be? If not, who do you think could be the "aspect of guile"?

Personally, I think Leblanc would be sort of a no-brainer, and for that, I don't believe she's the faceless. I think it has to be someone else, who probably has ties with the black rose, but isn't Leblanc herself. Either Elise or Katarina could be candidates. Or it could be simply a new character, who might eventually be released as a new champion in the future.