Super Bowl under the current contract rotates between 3 major networks every year, NBC, CBS, and FOX. FOX in 2020, CBS last year, NBC this year, FOX again next year. ABC gets back into the rotation with the next contract renewal (after this years Super Bowl) and appears to get it again in 2027.
And just like with product commercials, movie trailers are broadcast during the Super Bowl for all sorts of studios no matter what network its on. Is this to say that a Marvel trailer is guaranteed to be shown during this years Super Bowl, no. But I wouldn't be surprised if one was shown such as for Doctor Strange in the Multiverse of Madness.