Forbidden Knowledge Trailer Puzzle

Secret Trailer Cypher
Found by watching the "Don't Starve: Insanity Trailer" 16 seconds into the video. There are several more cyphers throuout the video. Notice that the M is bold. The signifigance is as of yet unknown. The cypher could by identified by noticing that it is 9x9 with a key of M, however there are many possible cyphers yet untired.