Not talking about the ship. Talking about the camera work, color grading, and lighting. The overall aesthetic. You're right though, this is much darker. Much easier to do darker on TV. The ship in that trailer, btw, is not the Discovery. It's the USS Shenzhou:
The USS Discovery is something more like this, last we heard:
Which is so goddamn awful and the backlash from the fans so intense, that it doesn't even appear in the trailer. Perhaps they'll come through and wow us with a surprise redesign.