Star Trek: 12 Things You Missed From The Discovery Season 4 Trailer
9. We're Not Saying It's The Borg, But It's The Borg
Along with several updated looks featured in this trailer (we'll get to the uniforms), Keyla Detmer's cybernetic enhancement has received a major revision between seasons 3 and 4.
While the cybernetic implant previously extended across her temple and around her eye, the application has been been reduced in size and no longer reaches her eye.
Also, at the risk of sounding like a bad fan theory (it's always either Q or the Borg), this implant does bear a striking resemblance to Seven of Nine's ocular implant as it appeared in Star Trek: Voyager.
Star Trek: Discovery season 3 made no mention of the Borg, but it's not hard to imagine that the 32nd century Federation has integrated their cybernetic technology into its own. But also it could have nothing to do with the Borg and we're just reaching.