According to Michael Bay, Transformers 4 will not have a comic book adaptation like the previous three movies.
"P.S. I bet it is something from Hasbro. This time they are not doing a comic
book of the movie because we want to keep our story under wraps. It must be
their version of a comic themed Transformers story they are creating."
This comment was attached to his earlier comment regarding the fake leaked script. While I do enjoy reading the comic book adaptations, I believe this is a good move. The comic was the main reason so many people knew about Sentinel switching sides and killing Ironhide. This huge piece of information caused some people to decide to tell everyone about it on the internet whether they wanted to hear it or not. Phasing out the comic book would prevent such plot details from being released before the release of the actual film.