Apparently, there was a leaked script for the fourth Transformers movie that was going around different websites and it eventually got the attention of Paramount and Michael Bay, who then released this statement.

Some Internet sites this morning reported that some document recovery guy has found a legitimate 120 page script of Transformers 4. I can absolutely 100 percent say this is completely false. The only two people in the world that have our unfinished script are Kruger and myself. Also we are only up to page 70 in our T4 script. Maybe this guy has a cartoon or something else – but definitely not our movie!
Bay

http://michaelbay.com/

Also, seems there won't be a comic adaption of the movie. Michael Bay just updated the message with this.

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.

From what I hear, some say that it's because the Dark of the Moon comic adaption spoiled the plot twist with Sentinel Prime because the comic adaption came out before the movie. I think it's kind of a shame because I collect and read the comics based on the movies. However, I am more interested in seeing what the movie will be about based off of the part where he says "Comic themed Transformers story".

EDIT

Here's a video by IGN about it.