Via RPLife @patsystew emailed Cosmopolis' executive producer, Gregoire Melin and according to him the trailer will be sent out (to the media?) this Friday. It might mean that they're planning to release the trailer soon but not exactly this Friday.
We can't be sure who he is addressing in his email. Could it be media outlets? Distributors? We'll have to wait and see.
"Patricia, you cannot announce any Cannes presence before April 19th I’m afraid (you can check this with Paulo)."
"As I told Anne, the trailer shall be sent out this Friday."
"Let me know should you need anything else from us. Looking forward to hearing from you soon."
"Best regards, Grégoire"