The Boruto movie featured the Chunin exams... there's no way in hell that episode 40 will be the Panda considering immediately after is the Chunin exams. Plus there's equally no chance in hell that the Panda "mission" was the first mission Boruto's team ever did.
Episode 40 will be the start of a new arc. Hopefully there will be a few more arcs/missions before the start of the movie arc, but I'd be fine with a single new arc as long as it becomes grittier similar to how the Land of Waves arc was back in Naruto.