User blog comment:Deathkin12/Teaser Theory/@comment-17706421-20151229145547/@comment-5297851-20151229160406

Zed actually has a few more connections with regards to eyes or sight.

According to his lore, he was envious of Shen because their master would favor Shen over him, he strives for his attention, and so to defeat Shen, Zed PEERED into the forbidden box where he learned the techniques of the shadows.

Another tie-in of Zed is the title of his rival, Shen, who known as the EYE of the twilight

Also he's a Ninja, someone who's not supposed to be SEEN

On Sona's case, I agree that her teaser has to have something to do about her being mute and her ties with music and sounds