In a red-carpet interview, Abrams says Luke Skywalker’s non-appearance in the trailers and poster is deliberate.
These are good questions to be asking. I can’t wait for you to find out the answers. It’s no accident…We were all thrilled that the trailer was seen and embraced, especially [from] people who were saying that they’re not even fans of Star Wars, but they’re interested in seeing this thing now. It’s a testament to all the amazing work that this cast and crew have done.