According to his Instagram, Dolph is shooting a "secret" project in Canada. Someone allegedly identified Vancouver airport on his photo.
If so, I checked British Columbia filming page, and as of now, they only mention a movie directed by Jay Hernandez currently filming. Doesn't seem unlikely. But it might be something totally différent, or not even a movie. Who knows (at least, given the "secrecy" and thé Time span it's not a Steve Luke or a quickie shoot).