ETA: Cineuropa tweeted about the date of the screening/premiere in Cannes
According to Cineuropa's article about Kinology's sales at Cannes, the official Cosmopolis' screening at the festival will be on May 25.
With three titles on show in the various Cannes selections, Parisian international sales agencyKinology, led by Grégoire Melin, is among the potential grand winners of the Film Market at the upcoming 65th Cannes Film Festival (May 16 to 27).
Kinology will complete already quite substantial sales for Canadian-French co-production Cosmopolis by David Cronenberg, a film to be officially screened in the festival’s competition on Friday, May 25.
Cineuropa is a very reliable site, but we don't know if they're confusing the screening date with the French release date (also May 25th).
We'll have confirmation soon. Cannes' schedule should be released in a few days (on May 10th according to replies to fans' emails from the official Festival's site). We will know for sure then.