The movie is currently focusing on the flash, but i may have a few references to others within the dc universe. But, in a way yeah it is affecting the dc universe. As the movie is based on flash rebirth and the Dc rebirth event itsself. Also,d ue to flashpoint being a canon event that had already taken place. And depending on how much attention this gets. It may even branch off into more movies based around the Dc universe itsself.