This secret was discovered on /r/Godzilla if you put all the red letters together from the first Godzilla Encounter post to the most recent they spell out "Serizawa" as in Dr. Serizawa from the Orginal 1954 Godzilla. Dr. Serizawa is known for creating the oxygen destroyer which defeats Godzilla in the first movie. The secret message is to gain access to tickets for the Godzilla Encounter at comic-con here use "Serizawa" as the code to unlock the tickets. With the mention of Serizawa does this mean Godzilla won't be surviving his big return to the big screen or will Destroyah be one of the monsters Godzilla will be fighting? Maybe the oxygen destroyer will create Destroyah during a test run, who knows? But I really hope we don't see Godzilla's death in this movie.