Something Wicked for TF5

No idea of what to make of a new tweet with video on the official TF5 account. What do you think? It shows some State Department document or something with the sate slashed through as it fritzes out with maybe another image underneath. The beeps turns out to be morse code and translates to "I'm Coming For You May 31st" other sites have translated it to "E I'm coming for you. May 31". Since filming just started but pre-production has been underway for months so the announcement could range from a kind of teaser trailer with images of planned Transformers for the film to a simply story synopsis with cast details.