As we would expect from a show set ten years before the original series, some of the characters from old-school Trek are going to show up here—including Sarek, Spock's dad, a character who's showed up repeatedly throughout the franchise.
This time around, Sarek is played by James Frain, spotted in the trailer talking to main character Michael Burnham (Sonequa Martin-Green), telling her that amazing people are needed to bring people together. And he would know—this isn't just a random Vulcan. Sarek is one of the most important political figures in the Federation, and is well-known around the Alpha Quadrant as an excellent ambassador.
Sarek's lines were also really intriguing, since they implied that Burnham has a strong connection to the Vulcans. Perhaps she's half-Vulcan, like Spock; in fact, it's possible that Sarek is Burnham's father, making her Spock's half-sister. Either way, seeing Sarek raised some fascinating possibilities.